The instant the chemical was added, the solution turned a deep blue, signaling that the reaction had begun.
化学物质加入的瞬间，溶液变成深蓝色，表明反应已经开始。
- It ceased operations shortly after the completion of the transcontinental telegraph, which could deliver messages almost instantly.
From a Rhetorical Synthesis question · Expression of Ideas
Which choice best defines “instant”?
B — Immediate, moment. “instant” means immediate, moment.
Which word means “immediate, moment”?
C — instant. “instant” means immediate, moment.
instant — immediate, moment. In Chinese: 立即的，瞬间的.
instant is pronounced /ˈɪnstənt/.
The instant the chemical was added, the solution turned a deep blue, signaling that the reaction had begun. (化学物质加入的瞬间，溶液变成深蓝色，表明反应已经开始。)
immediate, moment, flash — all close in meaning to instant (immediate, moment).
delayed, gradual — each the opposite of instant (immediate, moment).
Yes. instant is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
in(in)+stant(standing)