English words starting with O

The fraction equal to one part out of seven equal parts; 1/7.

achieved, done, or designed to be done in a single attempt or instance

Describing a garment, typically a dress or top, that leaves one shoulder bare while covering the other.

Involving or favoring one side, party, or viewpoint more than the other; not equal or balanced.

One part of sixteen equal parts of something; 1/16.

One of six equal parts of something; the quotient of one divided by six.

Designed to be suitable for a wide range of uses or users without modification.

A political concept or proposal advocating for a single, unified state entity, often in the context of resolving a territorial conflict by merging two rival communities or nations into one political unit.

A ballroom dance with a simple pattern of quick steps, popular in the early 20th century.

Providing or offering a comprehensive range of goods or services in a single place or through a single process.

(of a building) having only one floor or level.

done or completed with a single continuous movement or action, especially in writing or drawing

Consisting of a single syllable.

Of or relating to a statistical test for which the critical region is one-sided, so that it is designed to detect an effect in only one specified direction.

One part out of ten equal parts of something; 10%.

Lasting for or relating to a single, fixed period of time, especially in an official or academic context.

one of three equal parts of something

The fraction equal to one divided by thirty (1/30).

The time thirty minutes after one o'clock, either a.m. or p.m.

The cardinal number that is equal to 10 multiplied by 100; 1,000.

One of a thousand equal parts of something.

happening, done, or made only once

Happening, done, or available only once and not repeated.

Describing a relationship or communication from a single source to multiple recipients or destinations.

Involving two people or things that directly correspond with each other

Designed to be activated or operated by a single touch or press.

Limited to a single idea, interest, or course of action; narrow in focus.

Having only one notable skill, method, or area of expertise; limited in versatility.

One part out of twenty equal parts of something; the quotient resulting from the division of one by twenty.

A quick sequence of two punches, especially in boxing.

A phrase used to denote a simple sequence or count, often as a basic example or in instructional contexts.

To gain an advantage over someone, especially by doing something slightly better or more impressively.

The art or practice of gaining an advantage over someone else, especially in a competitive or social situation.

The art or practice of being or trying to be better than someone else, especially in a competitive or boastful way.

Consisting of or contained in a single book or volume.

Relating to or based on the principle of each person having a single vote.

allowing movement or travel in only one direction

Lasting for or relating to a period of seven days

Involving, performed by, or consisting of a single woman.

Consisting of a single word.

Relating to or advocating the idea of the world as a single, unified community, especially in political or economic terms.

Measuring one yard in length or distance.

Lasting for or relating to a period of one year

Relating to dreams or dreaming.

The state of being completely united or whole; the quality of being one single thing.

involving a great deal of effort, trouble, or difficulty; burdensome.

a person’s own self (used as the object of a verb or preposition when the subject is ‘one’ or an indefinite pronoun)

Continuing to exist, happen, or be done.

A round vegetable with a brown, red, or white skin and many layers, that has a strong smell and taste and is used in cooking.

a very thin, strong, translucent paper, originally made from onion skin but now typically from wood pulp.

(Nonstandard or archaic) A superlative form of 'only', meaning sole, single, or most unique.

Connected to or available through a computer or telecommunications network, especially the internet.

a person who watches something happening without being involved in it; a spectator.

used to say that no other or others of the same group exist or are present

The naming of a thing or action by a vocal imitation of the sound associated with it (e.g., buzz, hiss).

Relating to or involving words that imitate the sound associated with the thing or action they refer to.

a strong, fast, or forceful movement forward.

moving forward quickly and with force, often in a way that seems threatening or unstoppable

The beginning of something, especially something unpleasant

located on or moving towards the land, as opposed to the sea

A fierce or destructive attack.

In or onto the stage in a theatre; visible to the audience.

Relating to real existence or being, as opposed to merely conceptual or phenomenal aspects.

To a position on the surface of something.

Relating to the origin and development of an individual organism from embryo to adult.

the development of an individual organism from the earliest stage to maturity.

Relating to the branch of metaphysics dealing with the nature of being and existence.

The branch of metaphysics concerned with the nature of being and existence.

something that is one's duty or responsibility

in a continuing forward direction; ahead

in a continuing forward direction; ahead

a semi-precious variety of agate with different colours in layers, typically banded in shades of white, brown, and black.

A Hawaiian honeycreeper (bird) of the genus Moho, characterized by black plumage and yellow feather tufts, now extinct.

A thick-walled cell in the life cycle of some parasites, such as the malaria parasite, that is formed from a zygote and produces infective spores.

a cell in an ovary which may undergo meiotic division to form an ovum.

An exclamation used to express discomfort, surprise, or sympathy, often in reaction to a sudden impact, pain, or a striking event.

Used to express pleasure, surprise, admiration, or pain.

A type of dark tea, originally from China, that is partially fermented, giving it a flavor between green and black tea.

A deep, rhythmic, repeated sound made by brass instruments, especially tubas, in a band.

The quality of being exciting, energetic, or sexually attractive; vigor or enthusiasm.

An exclamation of surprise, excitement, or admiration.

An exclamation expressing admiration, surprise, excitement, or pleasure, often in reaction to something impressive or attractive.

An exclamation of surprise, excitement, or sudden realization.

used to express mild apology, surprise, or dismay, especially after a mistake or accident.

(of a fluid) to flow or leak out slowly

(of a liquid) flowing or leaking out slowly and steadily

Soft and wet, with a thick liquid slowly seeping out.

A surgical operation.

A piece of writing, typically in a newspaper or magazine, that expresses the personal opinion of the author and is not an official editorial of the publication.

The process of becoming opaque or losing transparency.

The quality of being difficult to see through; cloudiness or obscurity.

A semi-precious gemstone, typically milky white or bluish, with a soft, internal play of rainbow-like colours.

The quality of reflecting an iridescent play of colours like that of an opal.

having a soft, shimmering play of colors like that of an opal.

not able to be seen through; not transparent or translucent.

In a manner that does not allow light to pass through; not transparently.

The quality of being opaque; the state of not allowing light to pass through.

Not closed, fastened, or blocked; allowing access or passage.

(of information or a publication) freely available to the public without financial, legal, or technical barriers.

taking place or situated out of doors

(of a case or argument) so straightforward and clear-cut that it is easily decided or solved.

Referring to an exam or test in which students are allowed to consult their textbooks, notes, or other approved materials.

(of a material or structure) having a porous or permeable form where the individual cells or compartments are not completely sealed, allowing air or liquid to pass through.

(of a shirt) having the collar open at the neck, not buttoned.

Relating to or characteristic of rural areas that are not enclosed or built-up; having wide, unobstructed views of the countryside.

Allowing people to enter freely and without restriction.

Having no definite limit or conclusion; allowing for flexibility or extension.

Not having fixed limits or a definite conclusion; allowing for a variety of answers or outcomes.

The quality or state of not having fixed limits, goals, or answers; allowing for a wide range of possibilities or outcomes.

(of a school, course, or program) allowing students to join without having to pass strict entrance requirements or meet specific qualifications.

Having one's eyes open, especially as a sign of wakefulness or alertness.

Having the face uncovered or exposed.

Relating to or denoting a system of agriculture in which land is owned in common but cultivated by individual families or tenants.

Generous in giving; liberal.

Relating to or denoting surgery in which the heart is exposed and the blood made to bypass it, typically using a heart-lung machine.

Kind, honest, and not keeping thoughts or feelings hidden.

Relating to or denoting a process for making high-quality steel in a shallow, open furnace (hearth) that allows the flame to play on the metal and the lining.

Relating to or being an economic market with few or no restrictions on trade or participation.

A session or event, typically in a club or bar, where members of the public are invited to perform, especially by singing or telling jokes, using a microphone that is open for anyone to use.

Willing to consider new ideas; unprejudiced.