Subliminal (adjective)

1. Below the threshold of conscious awareness; operating or existing outside of conscious perception.
2. Operating or existing at a level below the level of conscious awareness.

Origin:

From latin "sub" meaning "beneath" and "limen" meaning "threshold".

Examples:

1. The advertisement contained subliminal messages designed to influence consumer behavior.
2. The hypnotist used subliminal techniques to help the patient overcome his fear.
3. The experiment was designed to test the effects of subliminal messages on the participants.
4. The subliminal message in the music was designed to affect the listeners' mood.
5. The artist used subliminal imagery in his paintings to convey a deeper meaning.