Which classification describes mesial or distal decay on the surfaces of molars and premolars?

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Decay on the mesial or distal surface of molars and premolars is called proximal caries on posterior teeth. This location describes the sides of the tooth toward and away from the midline, specifically on the back teeth. The other descriptions point to different locations: pits and fissures refer to the grooves on the chewing surfaces of molars and premolars, not the sides; anterior teeth involving the incisal edge involve front teeth and the biting edge; and decay on the mesial/distal surfaces of incisors and canines is proximal decay on anterior teeth. So the description that matches posterior proximal surfaces is the one describing mesial or distal decay on the surfaces of molars and premolars.