Polite term for one's own mother, used in formal or respectful contexts. Often written in kana.
My mother is out shopping now.
mother; mom; mum · wife (one's own) · you (elderly woman); she; her
mother (honorific)
mum; mom
Polite prefix お (o-) attached to かあ (kā), a shortened form of かか (kaka), an old affectionate term for mother. The exact derivation of かか is uncertain.