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Adjective

 * 1)  fullwidth

Etymology
ja, as in the square or the  of a CJK glyph

Noun

 * 1)  the state of being  and full-height which, in early computer encoding, occupies 2 bytes, and in modern typography, equals 1

Usage notes

 * This term is now only technically correct in the typographic sense. CJK characters in Unicode are at least 3 bytes.