At choice is a phrase that refers to the freedom to choose or select something from a range of options. There are several synonyms for this phrase which can be used to convey the same meaning. One such synonym is "at one's discretion," which means that the decision is entirely up to someone's judgment or choice. Other similar phrases include "at liberty," "as one pleases," "at one's option," and "in one's power." These words can be used interchangeably to express the idea that there are several options available and the decision is entirely in the hands of the decision maker.