sergeant-major Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a high-ranking non-commissioned officer in the army. Example Sentence He was sworn in as a sergeant-major. More Example Sentences He was respected as the sergeant-major. Synonyms first sergeant; senior sergeant; chief Antonyms private Hear It! Say It! Write It! sergeant-major Switch to cursive Start Share with your friends: