Hypertext Webster Gateway: "superposition"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Superposition \Su`per*po*si"tion\, n. [Cf. F. superposition. See
{Super-}, and {Position}.]
The act of superposing, or the state of being superposed; as,
the superposition of rocks; the superposition of one plane
figure on another, in geometry.
From WordNet (r) 1.7 (wn)
superposition
n : the placement of one thing on top of another
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