One's mother; the woman who gave birth to and raised someone (formal/neutral term; "haha" or "okaasan" are used commonly in conversation).
母親は毎朝、私に朝ごはんを作ってくれる。
My mother makes breakfast for me every morning.
学校の行事には母親が来てくれることが多い。
Mothers often come to school events.
彼女は母親としての責任を強く感じている。
She strongly feels her responsibilities as a mother.
母親と電話で話した。
I talked with my mother on the phone.