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sext (sometimes cap.) the fourth of the seven canonical hours, or the religious service held at this time.
sextant an instrument used for navigating according to the positions of the stars.
sextet a group of six, esp. six musicians playing or singing together. [2 definitions]
sextile the position or aspect of two celestial bodies that are sixty degrees apart.
sextillion the number represented by the Arabic numeral 1021. [2 definitions]
sexton a church official who looks after church property and in some cases rings the bells and buries the dead.
sextuple having six parts; sixfold. [4 definitions]
sextuplet one of six children delivered at one birth. [2 definitions]
sexual of or pertaining to sex or the sex organs. [3 definitions]
sexual dimorphism within one species, the existence of differing forms for males versus females, as, for example, in birds.
sexual harassment the repeated making of unwanted and unsolicited sexual remarks, behaviors, or propositions, especially on the part of one in a position of authority and toward a person of lower status within the same organization, often a workplace.
sexual intercourse the act of inserting the penis into the vagina, esp. when the ejaculation of semen occurs; coitus; copulation.
sexuality the fact of being male or female; sexual differentiation. [3 definitions]
sex up to stimulate sexually. [2 definitions]
sexy of a person, sexually attractive or exciting. [2 definitions]
Seychelles an island country in the Indian Ocean, northeast of Madagascar.
Seyfert galaxy any of numerous spiral galaxies that have a small bright nucleus and emit light and radio waves of variable intensity.
sf abbreviation of "science fiction."
sforzando with sudden force or strong emphasis; accented (used as a musical direction). [2 definitions]
sgraffito a technique of decorating ceramics or the like by cutting through a glaze or other surface later to reveal a ground of a different color. [3 definitions]
Sgt. abbreviation of "Sergeant."