因
HSK 6#679 by frequencyradical 囗
cause; reason; because
Examples
起火原因不明。
书页因年久而变黄
Part of the HSK 6 word list.
Learn 因 the way it sticks: in sentences built from words you already know, scheduled so you review right before you'd forget.
Start your free weekDefinitions adapted from CC-CEDICT (CC BY-SA 4.0, modified). Example sentences from Tatoeba (CC BY 2.0 FR). Frequency ranks from the BCC corpus. Full credits on the Attributions page.