I've met him just once.
I can't do it all at once.
Attaches to nouns to mean 'nothing but' or 'solely'. Common in set phrases like 正直一遍 (nothing but honesty) or 義理一遍 (just out of obligation).
His way of doing things is just perfunctory, with no real feeling.
That person is nothing but honest and lacks flexibility.
It's hard to memorize this kanji in a single try.
Well, let's just give it a try once.
perfunctory; superficial; conventional · chance; transient; stray