Longman Dictionary of Contemporary English
Douglas Harper's Etymology Dictionary
Wiktionary
a. 1 (context public policy legal ethics English) supportive of a woman's right to choose whether or not to have an abortion. 2 (context public policy legal ethics English) supportive of a person's right to choose whether or not to end their life by euthanasia. 3 supportive in general of a person's right to choose; supportive of self-determination, self-ownership, bodily integrity and individual sovereignty.
WordNet
adj. advocating a woman's right to control her own body (especially her right to an induced abortion) [ant: pro-life]
Usage examples of "pro-choice".
In 1992 when he was running against Les AuCoin, the Democratic Congressman who had been a pro-choice leader in the House, NARAL, the National Abortion Rights Action League, publicly, in spite of all the stories about Bob Packwood, endorsed and backed Pack-wood.
Repeal of the sex determination ban to be brought up again by the pro-choice faction.
In the simplest characterization, a pro-choicer would hold that the decision to abort a pregnancy is to be made only by the woman.
Pro-choice Clinton, like the two presidents before him, had already signed an order prohibiting any American funds from paying for abortions in foreign countries.