install v.

Proto-Indo-European root meaning "in."

It forms all or part of: and; atoll; dysentery; embargo; embarrass; embryo; empire; employ; en- (1) "in; into;" en- (2) "near, at, in, on, within;" enclave; endo-; enema; engine; enoptomancy; enter; enteric; enteritis; entero-; entice; ento-; entrails; envoy; envy; episode; esoteric; imbroglio; immolate; immure; impede; impend; impetus; important; impostor; impresario; impromptu; in; in- (2) "into, in, on, upon;" inchoate; incite; increase; inculcate; incumbent; industry; indigence; inflict; ingenuous; ingest; inly; inmost; inn; innate; inner; innuendo; inoculate; insignia; instant; intaglio; inter-; interim; interior; intern; internal; intestine; intimate (adj.) "closely acquainted, very familiar;" intra-; intricate; intrinsic; intro-; introduce; introduction; introit; introspect; invert; mesentery.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit antara- "interior;" Greek en "in," eis "into," endon "within;" Latin in "in, into," intro "inward," intra "inside, within;" Old Irish in, Welsh yn, Old Church Slavonic on-, Old English in "in, into," inne "within, inside."

"place in a stable for animals," Old English steall "standing place, position, state; place where cattle are kept, stable; fishing ground," from Proto-Germanic *stalli- (source also of Old Norse stallr "pedestal for idols, altar; crib, manger," Old Frisian stal, Old High German stall "stand, place, stable, stall," German Stall "stable," Stelle "place"), perhaps from PIE *stol-no-, suffixed form of root *stel- "to put, stand, put in order," with derivatives referring to a standing object or place.

Meaning "partially enclosed seat in a choir" is attested from c. 1400; that of "urinal in a men's room" is from 1967. Several meanings, including that of "a stand for selling" (mid-13c., implied in stallage), probably are from (or influenced by) Anglo-French and Old French estal "station, position; stall of a stable; stall in a market; a standing still; a standing firm" (12c., Modern French étal "butcher's stall"). This, along with Italian stallo "place," stalla "stable" is a borrowing from a Germanic source from the same root as the native English word.