Definition of field-grade officer in English:

field-grade officer

Syllabification: field-grade of·fi·cer

Entry from US English dictionary

noun

Military
A major, lieutenant colonel, or colonel.

Definition of field-grade officer in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous