a prolonged form of 3415 (from which some of the tenses are borrowed); to remind, i.e. (middle voice) to recall to mind:

KJV-- be mindful, remember.

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3415 mnaomai (mnah'-om-ahee);

middle voice of a derivative of 3306 or perhaps of the base of 3145 (through the idea of fixture in the mind or of mental grasp); to bear in mind, i.e. recollect; by implication to reward or punish:

KJV-- be mindful, remember, come (have) in remembrance. Compare 3403.