IPA: /kwɒn.tɪˈtæt.ɪv.li/
KK: /kwɑːn.tɪ.tə.tɪv.li/
In a way that relates to the amount or number of something, rather than its quality.
The researchers analyzed the data quantitatively to determine the effectiveness of the new drug.
Quantitatively → It is formed from "quantitas" (meaning quantity) and the suffix "-ively" (meaning in a manner of). The word "quantitatively" refers to measuring or considering something in terms of quantity.
Think of 'quantity' to remember that 'quantitatively' means measuring or considering something in terms of how much there is.