1. (noun)enclosure, inclosure something (usually a supporting document) that is enclosed in an envelope with a covering letter Synonyms: inclosure, envelopment, enclosure, enclosing, natural enclosure
2. (noun)enclosure, enclosing, envelopment, inclosure the act of enclosing something inside something else Synonyms: inclosure, envelopment, enclosure, enclosing, natural enclosure