The Collaborative International Dictionary
Substraction
Substraction \Sub*strac"tion\, n. [OF. substraction, F. soustraction. See Subtract.]
Subtraction; deduction. [Obs.]
(Law) See Subtraction,
Wiktionary
substraction
n. (context obsolete English) subtraction; deduction
Usage examples of "substraction".
He could also perform simple sums in addition, substraction, and multiplication.