field officer field of battle • field of fire · · · Info · Definitions · Synonyms · Characters · · field officer · · Text Common · · Latin · · Scripts 13 · · Length 4 · · Syllables Definitions · · · (noun) an officer holding the rank of major or lieutenant colonel or colonel. Synonyms: field-grade officer, field officer, FO. · · Noun Definition 1 Synonyms · · · field-grade officer · · Synonym 1 fo · · Synonym 2 Characters · · space U+0020 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072