1) Determine 2) Limit 3) Specify 4) To assign a quantity to 5) To determine the value of 6) Use as a quantifier 1) Gauge 2) Librate 3) Measure 4) Titrate 
To express as a numerical amount. ... (09 Oct 1997) ... 
(Learning Modules / Geography / Urban sustainability) To measure using statistics.
Quan'ti·fy transitive verb [ Latin quantus now much + -fy .] To modify or qualify with respect to quantity; to fix or express the quantity of; to rate. 
[v] - use as a quantifier 2. [v] - express as a number or measure or quantity
quantify 1. To determine the quantity of; to calculate or express the number, degree, or amount of something. 2. To use a quantifier to limit the range of individuals or items referred to in a sentence or proposition.
to determine, indicate, or express the quantity of. · to make explicit the quantity of (a proposition). · to give quantity to (something regarded as having only quality).
use as a quantifier