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

統合失調症: schizophrenia

nightfall, sunset / near the end of a certain period of time / year-end

the shape of the horns on some Japanese war helmets or 兜 (kabuto) / a 家紋 (kamon, “family crest”) with varying designs of helmet horns

Yamagata (a city in Gifu Prefecture, Japan)