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Definition of Father-in-law
1. Noun. The father of your spouse.
Definition of Father-in-law
1. Noun. One's spouse's father. ¹
2. Noun. (dated) A stepfather. ¹
¹ Source: wiktionary.com
Medical Definition of Father-in-law
1. The father of one's husband or wife; correlative to son-in-law and daughter-in-law. A man who marries a woman having children already, is sometimes, though erroneously, called their father-in-law. Source: Websters Dictionary (01 Mar 1998)