Collins COBUILD Advanced Learner's English Dictionary - one’s

Frequency: The word is one of the 3000 most common words in English. 1. Speakers and writers use one’s to indicate that something belongs or relates to people in general, or to themselves in particular. (FORMAL) ...a feeling of responsibility for the welfare of others in one’s community... = your DET 2. One’s can be used as a spoken form of ‘one is’ or ‘one has’, especially when ‘has’ is an auxiliary verb. No one’s going to hurt you. No one. Not any more... I think one’s got to consider all the possibilities. see one