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Definition of plain
plain - adj. lacking embellishment or ornamentation; free from any effort to soften to disguise; lacking patterns especially in color; not elaborate or elaborated; simple; not mixed with extraneous elements; lacking in physical beauty or proportion; clearly revealed to the mind or the senses or judgment; adv. unmistakably (`plain' is often used informally for `plainly'); noun extensive tract of level open land; a basic knitting stitch; verb express complaints, discontent, displeasure, or unhappiness.
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