Circle of latitude, commonly known as a parallel, is one of the key concepts in geography and cartography. There are several synonyms that can be used to refer to this term. One of the most commonly used synonyms is "parallel of latitude." This term refers to an imaginary circle on the surface of the Earth that runs parallel to the equator. Other synonyms for circle of latitude include "latitude circle," "latitude parallel," and "geographic parallel." These terms all describe the same concept, and are used interchangeably in geographical contexts to describe the imaginary circles that divide the Earth's surface into different latitudinal zones.