noun
shower; rainfall; a fall of rain
Refers to a single instance of rain, often a brief shower or a spell of rain. Commonly used in expressions like 一雨来そうだ (it looks like a shower is coming).
一雨来そうだから、傘を持っていこう。
It looks like a shower is coming, so let's take an umbrella.
一雨ごとに春が近づく。
With each rainfall, spring draws nearer.
Compound of 一 (ひと, 'one') and 雨 (あめ, 'rain'), literally 'one rain'.