Not open to participation by non-members or the public.

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

unreceptive to new ideas or information; not open to any agreement.

crowded tightly together

(linguistics) A syllable that ends in a consonant.

(algebra, field theory, of a field) Which contains as an element every root of every nonconstant univariate polynomial definable over it (i.e., over said field).

(military) To close the spacing between lines (ranks) of troops, as they are deployed across a battlefield, thereby decreasing the depth of the formation as it faces the enemy side.

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

plural of couple-close

plural of closed compound