a·ban·don 
(ə-băndən)
(ə-băndən)tr.v. a·ban·doned, a·ban·don·ing, a·ban·dons
1. To withdraw one's support or help from, especially in spite of duty, allegiance, or responsibility; desert: abandon a friend in trouble.
2. To give up by leaving or ceasing to operate or inhabit, especially as a result of danger or other impending threat: abandoned the ship.
3. To surrender one's claim to, right to, or interest in; give up entirely: abandon a belief. See Synonyms at relinquish.
4. To cease trying to continue; desist from: abandoned the search for the missing hiker.
5. To yield (oneself) completely, as to emotion.
n.
Great enthusiasm or lack of restraint: skied with abandon.
[Middle English abandounen, from Old French abandoner, from a bandon, at one's own discretion, without restraint : a, at (from Latin ad; see AD-) + bandon, control; see bhā-2 in the Appendix of Indo-European roots.]
a·bandon·er n.
a·bandon·ment n.