An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) To place in position or connect for service or use.
2) To establish in an office, position, or place (Dictionary.com).

From M.L. installare, from L. → in- + M.L. stallum "stall," from a Germanic source (compare O.H.G. stal "standing place, stand, place, stable, stall," Ger. Stall "stable," Stelle "place"), from PIE root *stel- "to put, stand;" cf. Gk. stele "standing block, slab," stellein "to set in order, arrange, array, equip, make ready."

Darhidan, literally "to place in," from dar "in, into," → in-, + -hidan present stem of (ne)hâdan "to put, place, establish" → position.

1) Something installed, as machinery or apparatus placed in position or connected for use.
2) The act of installing.
3) The fact of being installed (Dictionary.com).

→ install; → -tion.