When you express your right to something, you're making a claim to it, like telling your sister, "This bowl of cereal is mine.", 11 meanings: 1. to demand as being due or as one's property; assert one's title or right to 2. to assert as a fact; maintain. Click for more definitions., Define claim. claim synonyms, claim pronunciation, claim translation, English dictionary definition of claim. tr.v. claimed , claim·ing , claims 1. To demand, ask , , , .