Thayer's Greek Lexicon

 1. to arrange under, to subordinate
2. to subject, put in subjection
3. to subject one's self, obey
4. to submit to one's control
5. to yield to one's admonition or advice
6. to obey, be subject

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A Greek military term meaning "to arrange [troop divisions] in a
miliary fashion under the command of a leader". In non-military use,
it was "a voluntary attitude of giving in, cooperating, assuming
responsibility, and carrying a burden".