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sergeant in the U.S. Army, Marine Corps, or Air Force, any of several ranks of noncommissioned officers above the rank of corporal or airman first class. [3 definitions]
sergeant at arms an officer whose primary duty is to keep order in a legislature, court, social club, or the like.
sergeant first class in the U.S. Army, a noncommissioned officer who ranks above a staff sergeant and below a master sergeant.
sergeant major in the U.S. Army and Marine Corps, a noncommissioned officer of the highest rank. [3 definitions]
serial a work published, produced, or broadcast in regular installments. [4 definitions]
serialize to write, put, or publish (a story or the like) in serial form. [2 definitions]
serial number a number that is one of a series and is assigned to someone or something for identification, as to a soldier, automobile, or piece of paper currency.
seriatim in series; one after another.
series a group of related events, works, or objects that come one after another in sequence or are arranged in a particular order on the basis of a common characteristic. [2 definitions]
serif in typography, any of the extra-fine lines or extensions of lines that are added to the main strokes in some styles of type. (Cf. sans serif.)
serigraph a color print made by silk-screening.
serine a nonessential amino acid found in many proteins.
seriocomic serious and comical at the same time, as a novel or play.
serious marked by careful, weighty thinking. [4 definitions]
seriously with careful thought or consideration.
serious-minded of, having, or exhibiting serious purpose, earnest interest, or the like; not frivolous.
sermon a talk delivered during a religious service to instruct, enlighten, or inspire the congregation. [2 definitions]
sermonize to preach a sermon or sermons, or to speak as if doing so. [2 definitions]
Sermon on the Mount in the New Testament, the speech Jesus Christ delivered to his disciples on the Mount of Olives, in which he discoursed on those who are blessed.
serology the scientific study of the characteristics and effects of blood serum.
serotonin an organic compound found in human and animal tissue that constricts the blood vessels and raises the blood pressure, and that is an important neurotransmitter and hormone.