from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To determine or measure the quantity of.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To measure the quantity of. Esp. with high accuracy and including measurement uncertainty, as in quantitative analysis.
Back-formation from quantitative (analysis).(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from quantitative. (Wiktionary)