Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Envelope" Definition
noun
A flat paper container, especially for a letter, usually having a gummed flap.
Source: American Heritage Dictionary
Biology An enclosing structure or cover, such as a membrane or the outer coat of a virus.
Source: American Heritage Dictionary
Mathematics A curve or surface that is tangent to every one of a family of curves or surfaces.
Source: American Heritage Dictionary
Something that envelops; a wrapping.
Source: American Heritage Dictionary
The bag containing the gas in a balloon or airship.
Source: American Heritage Dictionary
idiom
Push the envelope To exceed the existing limits in a certain field; be innovative.
Source: American Heritage Dictionary
Push the envelope To increase the operating capabilities of a technological system.
Source: American Heritage Dictionary
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