i Register
In some senses, fo is marked as informal, vulgar, archaic. Watch for register when choosing this word.
fo
noun 5prep 1intj 1adj 1name 1
Definitions
noun
1
Abbreviation of folio, page and book size (10"-12.5" x 15"-20").
prep
1
Alternative spelling of fo'.
noun
1
Initialism of first officer.
2
Initialism of field officer.
3
Initialism of first-order logic.
4
Initialism of fuel oil.
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