plural of closed caption

(simile, colloquial) miserly, tight, or secretive

An enclosed precinct surrounding a cathedral.

(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).

plural of closed book

plural of close encounter

(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.

plural of close helmet

(physics, chemistry, engineering) A physical system whose interaction with its environment is limited to particular types of transfer, so that certain quantities are conserved within the system.

crowded tightly together