Moment
Instant
noun
A blink of time is a mere moment or instant.
しゅんじ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
言いたかったことを彼が瞬時にズバッと言ってくれたので、とても感心しました。
I was so impressed with him when he said that at the moment I was going to say it.