indoors
UK[ˌɪnˈdɔːz]US[ˌɪnˈdɔːrz]
adv
inside or into a building
Morpheme Breakdown
in
door
s
in
door
s
Etymology
The word 'indoors' is a relatively modern English formation, first recorded in the 18th century. It is a transparent compound of the preposition 'in' and the noun 'door', with the adverbial '-s' suffix. The logic is straightforward: the term literally means "within the doors," referring to the space inside the confines of a building's entrances. This spatial concept evolved from the Old English elements 'in' and 'duru/dor', which have Proto-Germanic and ultimately Proto-Indo-European origins relating to interiority and gateways, respectively. Over time, the specific literal sense broadened into the general adverb meaning "inside a building."
Analysis
Structure: in + door + s
- in (Old English): A preposition/adverb meaning "in, into, within, inside."
- door (Old English): A noun meaning "a movable barrier for opening and closing an entrance."
- s (Old English): A suffix forming adverbs of time, place, or manner, often from genitive case endings (e.g., always, nowadays, indoors).
Examples
The children were playing indoors because of the rain.
Please keep your pets indoors during the fireworks display.
She prefers to exercise indoors at the gym.