The display of text on a television or video screen, usually a transcription of the audio portion of a program as it occurs (either verbatim or in edited form), most frequently used by the deaf and language learners. Closed captions are encoded invisibly, and displayed by a decoder.

(television) Text which can be displayed on a television or other video screen with suitable equipment, usually a transcription or description of audio material.

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

(topology) A set whose complement is open.

crowded tightly together

(simile, colloquial) miserly, tight, or secretive

harp shackle

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 caption