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Definition of deep
deep - adj. exhibiting great cunning usually with secrecy; strong; intense; very distant in time or space; having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination; relatively deep or strong; affecting one deeply; with head or back bent low; large in quantity or size; extreme; marked by depth of thinking; relatively thick from top to bottom; extending relatively far inward; difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge; of an obscure nature; having or denoting a low vocal or instrumental range; (of darkness) very intense; adv. to far into space; to an advanced time; to a great depth; noun literary term for an ocean; the central and most intense or profound part; a long steep-sided depression in the ocean floor.
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