Series

sē′ri-ēz, n.sing. and pl. a succe ion of things connected by some likene : sequence: order: ( math. ) a progre ion of numbers or quantities according to a certain law.— Arithmetical series , a series whose terms progre by the addition or subtraction of a constant difference; Geometrical series , a series whose succe ive terms progre by a constant multiplier or divisor—the common ratio ; Reciprocal series , a series each of whose terms is the reciprocal of the corresponding term of another series. [L.,— serĕre, sertum , to join.]