2. Feeling sure or certain of a fact or issue; assurance, certitude; assured expectation.
3. Assurance, boldness, fearlessness, arising from reliance (on oneself, on circumstances, on divine support, etc.).
4. The confiding of private or secret matters to another; the relation of intimacy or trust between persons so confiding; confidential intimacy.
Confidence is the feeling that you have just before you fully understand the situation. Belief in yourself is a fine thing, but you should see to it that you are not too easily convinced; because confidence is that quiet, absolutely assured feeling you have just before you fall flat on your rear end.