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1.
VERB:

1. To leave somebody or something behind for others to look after, especially somebody or something meant to be a personal responsibility.

2. To leave a place or vehicle, especially for reasons of safety and without intending to return soon.

3. To renounce or reject something previously done or used

4. To surrender control of something completely to somebody else.

5. To stop doing something before it is completed, usually because of difficulty or danger.

6. To abandon yourself: To give yourself over to a powerful emotion.

NOUN:

*Complete lack of inhibition or self-restraint.
VERB:

1. Pets abandoned by their owners.
2. They had to abandon their vehicles in the snow.
3. The practice was abandoned long ago.
4. As troops closed in the town was abandoned to its fate.
5. Abandoning the rescue attempt.
6. He abandoned himself to his grief.

NOUN:

*French "abandoner" -> "under control".
by Jafje April 25, 2007
 
2.
1. To give up to the control or influence of another person or agent. To give up with the intent of never again claiming a right or interest in

2. To withdraw from often in the face of danger or encroachment

3. To withdraw protection, support, or help from
The boat was blown to bits. The sailors had no choice but to abandon Ship.
by MoonCricket March 27, 2005