The term 'circumflex COUSIN' is a combination of two words: circumflex and COUSIN. Circumflex is a diacritical mark (ˆ) used in many languages, including French, Spanish, and Portuguese, to indicate a variety of different pronunciations. The word 'COUSIN' refers to a relative who is related to another person through their parents' siblings. Therefore, the term 'circumflex COUSIN' can be used to describe a relative who is related to another person through their parents' siblings and who speaks a language that uses the circumflex diacritical mark.