What is "envelope" in English? Definition and Explanations

Meaning of "envelope": a flat (usually rectangular) container for a letter, thin package, etc.

Noun

Meaning of "envelope": any wrapper or covering

Noun

Meaning of "envelope": a curve that is tangent to each of a family of curves

Noun

Meaning of "envelope": a natural covering (as by a fluid)

Noun

Meaning of "envelope": the maximum operating capability of a system (especially an aircraft)

Noun

Meaning of "envelope": the bag containing the gas in a balloon

Noun

Synonyms:

box, jacket, casing, container, coat, pocket, bag, pouch, case, shell, hide, covering, cover, cloak, skin, vesicle, sheath, coating, receptacle, enclosure, wrapping,

Antonyms:

interior, middle,