English words starting with O

Taking place or existing on a road or roads.

Taking place at the location of an event, especially an accident, crime, or emergency.

appearing or taking place within the frame of a cinema, television, or computer screen

Located at the place where a particular activity happens or where a particular thing is situated.

Taking place or designed for use on the surface of snow.

located on or taking place on a public street or road

Exactly correct or accurate; achieving the intended goal.

Taking place or existing on the actual site of an activity, especially a sports game or military operation.

Busy and active, constantly moving from one place or task to another

Based on direct observation or experience in a real situation, rather than from theories or reports.

Relating to or occurring during the course of one's employment.

Officially noted or declared and therefore publicly attributable

Happening or existing while traveling or on a journey

Present at and witnessing an event as it happens

done or happening immediately and in the place where someone or something is

Happening or done at the scheduled or expected time; punctual.

Making progress and likely to succeed or achieve something as planned.

the act of withdrawing the penis before ejaculation during sexual intercourse.

On one occasion only; one time.

Happening, done, or used one time every day; daily.

Happening or done one time every month; monthly.

Happening, appearing, or done one time every week

Happening or done one time every year; annual.

Complete and final; putting an end to doubt or uncertainty.

Happening, done, or taken once every day.

Having previously held a position of commanding power, influence, or prevalence, but no longer doing so.

Previously well-known or celebrated, but no longer so.

Formerly great, powerful, or influential; used to describe something that has declined from a previous state of excellence or importance.

Used to describe something that happens, appears, or is of a quality that is seen only once in the lifetime of a typical generation, and is therefore extremely rare or significant.

Describing an opportunity or experience that is so rare or special it is unlikely to happen again in a person's life.

Having previously been very powerful, influential, or successful, but no longer being so.

A quick, casual, and often superficial examination or inspection.

Formerly popular or fashionable but no longer so.

Having previously been strong, influential, or effective, but no longer so.

Describing something or someone that was previously thought likely to be successful or to show great potential, but is no longer so.

Formerly having a sense of justifiable self-respect or distinction, but no longer so.

Describing a place, person, or thing that was previously quiet, inactive, or dull but is no longer so.

Having been successful, lively, or prosperous in the past but no longer so.

Formerly white; having lost its original white color.

A tropical disease caused by infection with a parasitic worm transmitted by the bite of blackflies, often resulting in skin lesions and eye damage that can lead to blindness.

A gene which in certain circumstances can transform a cell into a tumor cell.

a doctor who specializes in the study and treatment of tumors and cancer

The branch of medicine that deals with the study, diagnosis, and treatment of cancer.

approaching or moving nearer in time or space

A drug used to prevent and treat nausea and vomiting, especially that caused by chemotherapy, radiotherapy, or surgery.

The lowest cardinal number; half of two; 1

Describing a piece of land that measures one acre in area.

Consisting of a single short play or dramatic piece.

Being one complete unit plus a half of another unit; amounting to 1.5.

Used to emphasize that someone or something is unique, special, and irreplaceable.

Having or using only one arm.

having only one arm

Having or consisting of a single bedroom.

Designed to be operated or controlled by a single button.

Considering or dealing with each person or thing separately, in order.

Involving or designed for a single car

Consisting of a single cell; unicellular.

Relating to or being a policy that limits a family to having only one child.

The principle that there is only one sovereign state of China, encompassing the mainland, Taiwan, Hong Kong, and Macau, and that Taiwan is an inalienable part of China.

Describing an action or process that is completed with a single click of a computer mouse or similar device.

Relating to or designed for a single serving of a beverage, typically measured by the volume of a standard cup.

Lasting for, occurring on, or designed for a single day

Considering or presenting something in a single, often oversimplified, aspect; lacking depth or complexity.

Consisting of or suitable for a single main course of a meal.

costing or valued at one dollar

Having only one ear, either literally or figuratively.

one of eight equal parts of something

A complete reversal of direction or opinion; a turn of 180 degrees.

Having only one eye.

Involving or dependent on a single element or cause.

The number 115; one hundred and fifteen.

One of five equal parts of something; the fraction equal to 1 divided by 5.

One of fifty equal parts of something; the quotient resulting from the division of one by fifty.

The number 150.

Having or using only one foot.

Having only one foot.

one of four equal parts of something; 1/4

A sporting contest, especially in baseball or basketball, that is decided by a single game, often used to break a tie in a series.

The fraction equal to one divided by two; 1/2.

Designed for, performed by, or involving the use of only one hand.

Using or involving only one hand.

Describing a person or thing that achieves great success only once, typically in popular entertainment.

A baseball game in which one team allows only one base hit.

(of a town or business) small and unimportant

Lasting for one hour.

Being ten times ten; the number 100.

one of a hundred equal parts of something; 1/100

Used to describe someone or something that is extremely rare, unique, or exceptionally good.

Focusing on or concerned with only a single topic or problem, especially in politics.

Having only a single lane for traffic moving in one or both directions.

Having only one leg.

Consisting of or contained in a single line of text or code.

a joke or witty remark that is very short and often delivered in a single sentence.

Involving, performed by, or consisting of a single person

Measuring one meter in length, height, or distance.

Measuring or extending for one mile in length or distance.

lasting for one minute

Lasting for or relating to a period of one month

Lasting for or occurring during a single night.

A performance, event, or engagement that lasts for only one night.

Lacking variety or depth; monotonous and repetitive in character or style.

Completely unique; unlike anything or anyone else.

done, made, or happening only once and not repeated

involving two people communicating or competing directly with each other

Weighing one ounce.

A situation in baseball where a batter is retired, leaving only one out remaining in the inning.

Consisting of or contained on a single page.

Consisting of or contained within a single paragraph.

Involving or relating to a single parent, especially in a family structure.

Relating to or denoting a political system in which only one political party is permitted or has a realistic chance of gaining power.

Involving, done by, or consisting of a single individual.

Consisting of or made in a single undivided piece.

Having or consisting of a single point, especially in sports statistics or measurements.

(of a dish or meal) cooked or prepared using only one pot or pan

Weighing or costing one pound.

one of four equal parts of something; 25%

Consisting of or having only a single room.

In baseball, denoting a game or victory decided by a single run.

lasting for or relating to a single semester of an academic year

Consisting of or contained within a single sentence.