Meaning of sergeant

[Guryl]

English Grammar Tests, Elementary Level

ESL/EFL Test #127 "Real Life: Occupations (2)", question 9

Keith is a .......... He is an enlisted member of the armed forces and he serves and protects his country under the command of a sergeant.

(a) soldier
(b) boxer
(c) policeman
(d) firefighter

English Grammar Tests, Elementary Level

ESL/EFL Test #127 "Real Life: Occupations (2)", answer 9

Keith is a soldier. He is an enlisted member of the armed forces and he serves and protects his country under the command of a sergeant.

Correct answer: (a) soldier
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I don't understand the word: "sergeant" mean?

Guryl

[Kitosdad]

I don't understand what the word:" sergeant"means.

Please, DO buy a dictionary!
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Englishman living in Germany.