plural of envelope stuffer

plural of double envelopment

(military) pincer attack

(mathematical analysis, of a set) Convex hull.

(mathematics, optimisation theory, of a function on a set) For a given set S⊆ℝⁿ and real-valued function f defined on the convex hull conv(S), the lowest-valued concave function that overestimates or equals f over S.

A large thick envelope, now usually coated with foam or bubblewrap, used to protect fragile items in the mail.

(US) An envelope whose mailing for an authorized purpose does not requiring postage, while its unauthorized use may be penalized.

An airmail envelope with a distinct pattern of spaced diamonds in alternating red and blue colours around the outer edge.

(marketing) A plain envelope with no window showing the contents, used to make junk mail resemble legitimate correspondence.

simple past tense and past participle of stretch the envelope