- a flat paper container, as for a letter or thin package, usually having a gummed flap or other means of closure.
- something that envelops; a wrapper, integument, or surrounding cover.
- a surrounding or enclosing structure, as a corolla or an outer membrane.
- a curve or surface tangent to each member of a set of curves or surfaces.
- (of a modulated carrier wave) a curve connecting the peaks of a graph of the instantaneous value of the electric or magnetic component of the carrier wave as a function of time.
- the fabric structure enclosing the gasbag of an aerostat.
- the gasbag itself.
- the airtight glass or metal housing of a vacuum tube.
- the technical limits within which an aircraft or electronic system may be safely operated.
- to stretch established limits, as in technological advance or social innovation.
- a flat covering of paper, usually rectangular in shape and with a flap that can be folded over and sealed, used to enclose a letter, etc
- any covering or wrapper
- any enclosing structure, such as a membrane, shell, or skin
- the bag enclosing the gas in a balloon
- a curve or surface that is tangent to each one of a group of curves or surfaces
- the sealed glass or metal housing of a valve, electric light, etc
- the outer shape of a modulated wave, formed by the peaks of successive cycles of the carrier wave
- to push the boundaries of what is possible
