plural of close helmet

(education) Referring to an examination in which external resources such as glossaries, study notes, and calculators are prohibited.

(uncountable, chess) A chess opening characterized by the moves 1.d4 d5, in which both White and Black move their queen's pawn to the fourth rank with their first move.

plural of close-stool

(mathematics) an interval in the real number line which contains its supremum and infimum.

near each other in time or space.

An adoption where the identity of the biological parents is kept as a secret from the child and their adoptive parents.

plural of closed adoption

tight-fisted, stingy

(phonetics, of a vowel) pronounced with the tongue in a position approximately two-thirds of the way between an open and a close vowel