their
• possessive determiner 1 belonging to or associated with the people or things previously mentioned or easily identified. 2 belonging to or associated with a person of unspecified sex (used in place of either ‘his’ or ‘his or her’). 3 (Their) used in titles. — USAGE On the use of their in the singular to mean ‘his or her’, see note at THEY. — ORIGIN Old Norse.
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