deciding
n. B1 Intermediate US //ˌdɪˈsaɪdɪŋ// UK //dɪsˈaɪdɪŋ// de·cid·ing
n. the most important thing that helps you make a final choice or reach a result. You use this when one specific fact or event settles a situation.
n. serving to resolve a question or determine an outcome. Often modifies nouns related to competition or choice, such as 'factor', 'vote', or 'moment'.
The weather was the deciding factor for our trip.
After a long debate, the chairman cast the deciding vote to approve the new budget.
While both candidates performed well in the debates, the deciding factor for many voters was the incumbent's handling of the recent economic crisis.
Usage
Typically used as an attributive adjective, appearing immediately before the noun it modifies.