early 14c., "an attack of fever," from O.Fr. acces "onslaught" (14c.), from L. accessus "a coming to, an approach," pp. of accedere "approach" (see accede). Meaning "habit or power of getting into the presence of (someone or something)" is from late 14c. As a verb, first recorded 1962. Accession "act of coming to a position," especially of a throne, is 1769 (first recorded in Burke).