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.

三角形: triangle

三月, 3月: March

三人: three people

三男: third son; three men

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

三葉機: triplane

画賛, 画讃: / 臥蚕: a silkworm that is resting in preparation for moulting

七七日: the forty-ninth day after a person dies; the Buddhist memorial service that occurs forty-nine days after a person dies