Their/ðer/ Definition 1 of 3Pro Tip 1/3Multiple Ownership Shows that an item is owned by more than one person, indicating joint possession. They entered their shared office. Pro Tip 2/3Personal Connection Emphasizes a personal relationship or relevance to the people being referred to. Their opinions on the matter were quite strong. Pro Tip 3/3Emotional Implication Can hint at care or pride the people have in what they own or are connected with. Their homemade cookies always taste the best.