mother · noun C /ˈmʌð.ər/Full view
Nouns: mother, motherhood, mother-in-law
Adjectives: motherly
Verbs: mother
mother
A1 a female parent
Dictionary examples:

a single mother

My mother was 21 when she got married.

My mother and father came to England in 1944.

Learner example:

Eduardo is a good boy [...] he help[s] his mother at home. (Skills for Life (Entry 1); A1; Panjabi)

mother tongue
B2 the first language that you learn when you are a child
Dictionary example:

Italian is my mother tongue but I started to learn English when I was six.

Learner example:

I can speak English and French fluently, added to my mother tongue, Japanese. (First Certificate in English; B2; Japanese)

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