Definition of FIL in English:

FIL

Line breaks: FIL

noun

informal
  • A person’s father-in-law: my in-laws helped tremendously—my MIL prepared food and my FIL helped move boxes and furniture
    More example sentences
    • I'm sure your FIL was trying to be helpful.
    • My FIL pays $150 a month to keep more stuff in a storage unit than he can fit in his already overcrowded townhouse.
    • My divorced parents lived 1700 miles away, my FIL lives 3000 miles away, and my MIL lives 100 miles away.

Origin

1960s: abbreviation.

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Word of the day milord
Pronunciation: mɪˈlɔːd
noun
used to address an English nobleman