1Normal, ordinary — not special; a common or standard state or quality.
彼は普通の会社員だ。
He is an ordinary office worker.
普通サイズのシャツをください。
Please give me a regular-size shirt.
これはごく普通の家庭でよくある話だ。
This is a story common in perfectly ordinary households.
彼女の考え方は普通ではない。
Her way of thinking isn't normal.
2As an adverb, meaning normally, usually, or generally — close to "普段は" or "一般的には."
普通は朝ごはんを食べます。
I usually eat breakfast.
普通ならもっと時間がかかるはずだ。
Normally it should take more time.
彼は普通あまり人前で話さない。
He normally doesn't speak much in public.
3A local train that stops at every station — short for "普通列車," commonly used on station signs and in everyday speech.
この電車は普通で、各駅に停まります。
This train is a local, stopping at every station.
新幹線ではなく普通で行くから時間がかかるよ。
I'm taking the local train, not the bullet train, so it will take longer.