'Father-in-law' definitions:

Definition of 'father-in-law'

noun

The father of your spouse

Definition of 'Father-in-law'

From: GCIDE

Father-in-law \Fa"ther-in-law`\, n.; pl. Fathers-in-law. The father of one's husband or wife; -- correlative to son-in-law and daughter-in-law. [1913 Webster]
Note: A man who marries a woman having children already, is sometimes, though erroneously, called their father-in-law. [1913 Webster]

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