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small; little; slight
slightly less than; just about
somewhat; somehow
minor; petty
「小」 has other readings with different meanings.
小さい頃からピアノを習っていた。
I've been learning piano since I was small.
小一時間ほど待っていたんだよ。
I was waiting for almost an hour.
小雨が降り始めたみたいだね。
It seems like light rain has started.