An Etymological Dictionary of Astronomy and Astrophysics
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Of two sets A and B, the set A if it is contained in B (A ⊂ B) but is not equal to B (A ≠ B).

→ proper; → subset.

A set of elements wholly contained in another set. If each element of a set A belongs to a set B, A is called a subset of B, written A ⊂ B or B ⊃ A and read "A is contained in B" or "B contains A" respectively.

→ sub- + → set.