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)
