The ordered arrangement of objects such as to create the greatest density (e.g. of atoms in a crystal).

plural of close shave

(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 couple-close

(heraldry) A diminutive of the chevron, always borne in closely placed pairs.

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

plural of closed circuit

(linguistics) A syllable that ends in a consonant.

(computing) A testing arrangement in which a beta test version of software is distributed to a small group of testers.

plural of close season