Instantly
来自Big Physics
late Middle English (in instant (sense 2 of the adjective, sense 3 of the adjective, sense 4 of the adjective)): via Old French from Latin instant- ‘being at hand’, from the verb instare, from in- ‘in, at’ + stare ‘to stand’.
wiktionary
From instant + -ly.
etymonline
instantly (adv.)
late 15c., "urgently, persistently," from instant (adj.) + -ly (2). Meaning "immediately, without any intervening time" is 1550s.
