A lot vs. Alot: 9 Grammatical Pitfalls
1540s, from Latin subtractus, past participle of subtrahere (see subtraction). Related: Subtracted; subtracting. Earlier verb form was subtraien (early 15c.).
Here he teches þe Craft how þou schalt know, whan þou hast subtrayd, wheþer þou hast wel ydo or no. ["Craft of Numbering," c.1425]