Etymology
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scalar (adj.)

1650s, "resembling a ladder," from Latin scalaris "of or pertaining to a ladder," from scalae (plural) "ladder, steps, flight of steps" (see scale (n.2)). The noun in the mathematical sense of "a real number" is from 1846, coined by Irish mathematician William R. Hamilton (1805-1865), who can explain why it is the correct word for that.

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Definitions of scalar
1
scalar (adj.)
of or relating to a musical scale;
he played some basic scalar patterns on his guitar
scalar (adj.)
of or relating to a directionless magnitude (such as mass or speed etc.) that is completely specified by its magnitude;
scalar quantity
2
scalar (n.)
a variable quantity that cannot be resolved into components;
From wordnet.princeton.edu