instal

UK: /ɪnˈstɔːl/ US: (in stôl′)

WordReference Random House Unabridged Dictionary of American English © 2025

in•stal  (in stôl′), v.t., -stalled, -stal•ling. 

1. install.

WordReference Random House Learner's Dictionary of American English © 2025

in•stall or in•stal /ɪnˈstɔl/   v. [~ + object] , -stalled, -stall•ing or -stal•ling. 

1. to place in position for use:
   to install a heating system.
2. to establish (someone) in an office or place:
   to install the vice-president in her new office.
3. to bring (someone) into an office with ceremonies:
   He was installed as the archbishop.

in•stall•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2025

in•stall  (in stôl′), v.t. 

1. to place in position or connect for service or use:
   to install a heating system.
2. to establish in an office, position, or place:
   to install oneself in new quarters.
3. to induct into an office or the like with ceremonies or formalities.

Also, instal. 

• Medieval Latin installāre. See in-², stall¹
• late Middle English 1375–1425

in•stall′er, n. 
Synonyms

• 3. invest, instate, receive.

Collins Concise English Dictionary © HarperCollins Publishers::

install, instal / ɪnˈstɔːl/ verb ( -stalls, -stalling, -stalled, -stals, -stalling, -stalled)(transitive)

1. to place (machinery, equipment, etc) in position and connect and adjust for use
2. to transfer (computer software) from a distribution file to a permanent location on disk, and prepare it for its particular environment and application
3. to put in a position, rank, etc
4. to settle (a person, esp oneself) in a position or state: she installed herself in an armchair

Etymology: 16th Century: from Medieval Latin installāre, from in-² + stallum stall¹

inˈstaller noun