いっしゅん
instant, for a moment
一 one 瞬 blink, the same 瞬 that sits in 瞬間. That is precisely how long you spent not believing your own ears: いっしゅん.
瞬間 しゅんかん is the moment itself; 一瞬 is 'for an instant', and behaves like an adverb.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.