. . . . . . "Concept" . "Concept" . "Concept" . "Concept" . "Concept" . "UMLS Concept" . . . . . . "An idea or notion; a unit of thought." . "An idea or notion; a unit of thought." . "An idea or notion; a unit of thought." . "An idea or notion; a unit of thought." . "An idea or notion; a unit of thought." .