The Collaborative International Dictionary of English v.0.48:

Embed \Em*bed"\ ([e^]m*b[e^]d"), v. t. [imp. & p. p. Embedded;
   p. pr. & vb. n. Embedding.] [Pref. em- + bed. Cf. Imbed.]
   To lay as in a bed; to lay in surrounding matter; to bed; as,
   to embed a thing in clay, mortar, or sand.
   [1913 Webster]

The Free On-line Dictionary of Computing (30 December 2018):

embedding

   1.  One instance of some mathematical object
   contained with in another instance, e.g. a group which is a
   subgroup.

   2.  (domain theory) A complete partial order F in
   [X -> Y] is an embedding if

   (1) For all x1, x2 in X, x1 <= x2  <=>  F x1 <= F x2 and

   (2) For all y in Y, x | F x <= y is directed.

   ("<=" is written in LaTeX as \sqsubseteq).

   (1995-03-27)