Having to do with or arranged in a series. / (of a person) Who performs a specified action or course of action repeatedly or regularly. / Published or produced in installments.

A work, such as a work of fiction, published in installments, often numbered and without a specified end. / A publication issued in successive parts, often numbered and with no predetermined end.

(transitive) to assign a serial number to (especially of aircraft)

(mathematical analysis) The sum of the terms in an arithmetic progression.

(mathematical analysis) Any infinite series whose terms are in geometric progression; any series of the form a+ar+ar²+ar³⋯=a∑ᵢ₌₀ ᪲rⁱ.

plural of seraph

Lobophora halterata, a species of Geometrid moth.

Calm, peaceful, unruffled. / Without worry or anxiety; unaffected by disturbance. / (archaic) Fair and unclouded (as of the sky); clear; unobscured.

(transitive) To make serene.

(poetic) Serenity; clearness; calmness.