Definitions from Wiktionary ( )

▸ adjective:  (physiology) Of a stimulus: below the limen or threshold of conscious perception, especially if still able to produce a response; also (generally), below the threshold where a response can be produced.
▸ adjective:  (psychology) Without directed awareness or thought; subconscious (dated), unconscious.
▸ adjective:  (by extension) Of an advertisement, a message, etc.: conveyed in a manner that a person is unaware of being influenced by it.
▸ noun:  (physiology) Chiefly preceded by the: something which is below the limen or threshold of conscious perception.
▸ noun:  (psychology) Chiefly preceded by the: the subconscious (dated) or unconscious self.
▸ noun:  (by extension) An advertisement, a message, etc., which is conveyed in a manner that a person is unaware of being influenced by it.

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