Easton's Bible Dictionary (1897)
(Ex. 12:38), a class who accompanied the Israelites as they journeyed from Rameses to Succoth, the first stage of the Exodus. These were probably miscellaneous hangers-on to the Hebrews, whether Egyptians of the lower orders, or the remains of the Hyksos (see EGYPT; MOSES), as some think. The same thing happened on the return of the Jews from Babylon (Neh. 13:3), a “mixed multitude” accompanied them so far.
Smith's Bible Dictionary (1863)
” (Exodus 12:38; Numbers 11:4) They were probably the offspring of marriages contracted between the Israelites and the Egyptians; and the term may also include all those who were not of pure Israelite blood. In Exodus and Numbers it probably denoted the miscellaneous hangers-on of the Hebrew camp, whether they were the issue of spurious marriages with Egyptians or were themselves Egyptians, or belonging to other nations. The same happened on the return from Babylon, and in (Nehemiah 13:3) (comp.
vs Nehe 13:23-30) a slight clue is given by which the meaning of the “mixed multitude” may be more definitely ascertained.
Schaff's Bible Dictionary
MIXED MULTITUDE, an expression occurring Ex 12:38; Num 11:4, and Neh 13:3, and denoting people who congregated with the Israelites without being of pure Israelite blood. By some it is explained as referring to the offspring of mixed marriages between Israelites and those nations among which they lived; by others as referring simply to those hangers - on who are always found hovering on the outskirts of a great camp.