Secundum artem.—According to rule.
Selon les règles.—According to rule.
Semper fidelis.—Always faithful.
Semper idem.—Always the same.
Semper paratus.—Always ready.
Senatûs consultum.—A decree of the senate.
Seriatim.—In order; successively.
Si quæris peninsulam amœnam, circumspice.—If thou seekest a beautiful peninsula, behold it here.
Sic in originali.—So it stands in the original.
Sic itur ad astra.—Such is the way to immortality.