Etymology
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subtraction (n.)

c. 1400, "withdrawal, removal," from Late Latin subtractionem (nominative subtractio) "a drawing back, taking away," from past participle stem of Latin subtrahere "take away, draw off, draw from below," from sub "from under" (see sub-) + trahere "to pull, draw" (see tract (n.1)). The mathematical sense is attested from early 15c.

Þou most know þat subtraccion is drawynge of one nowmber oute of anoþer nomber. ["The Crafte of Nombrynge," c. 1425]

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Definitions of subtraction

subtraction (n.)
an arithmetic operation in which the difference between two numbers is calculated;
the subtraction of three from four leaves one
Synonyms: minus
subtraction (n.)
the act of subtracting (removing a part from the whole);
he complained about the subtraction of money from their paychecks
Synonyms: deduction
From wordnet.princeton.edu