酸化: oxidize, become oxidized / 参加: participate, join, take part

A title used after person's name (first name or surname) regardless of sex; Mr, Ms, Mrs, Miss. Also used after a job title and a company name. / (colloquial) Used after a shop name.

三人: three people

三角形: triangle

三月, 3月: March

賛意: assent / 三位: third rank / 三尉: second lieutenant

free-for-all fight / melee

(telephony) crossed line

(telephony) to have a crossed line occur

(neologism) marriage-hunting (in a way similar to job hunting); matchmaking activity