install
Pronunciation: /ɪnˈstɔːl/
(also instal)
verb ( installs or instals, installing, installed)

Origin:
late Middle English (in install (sense 2)): from medieval Latin installare, from in- 'into' + stallum 'place, stall'. install (sense 1) dates from the mid 19th century

Spelling help
Spell install and the related word installation with a double l.