What is the meaning of Subliminal?

Of a stimulus: below the limen or threshold of conscious perception, especially if still able to produce a response; also , below the threshold where a response can be produced.

Without directed awareness or thought; subconscious , unconscious.

Of an advertisement, a message, etc.: conveyed in a manner that a person is unaware of being influenced by it.

Chiefly preceded by the: something which is below the limen or threshold of conscious perception.

Chiefly preceded by the: the subconscious or unconscious self.

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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Source: wiktionary.org