Wiktionary
distributive number
n. (context grammar English) A word that answers "how many times each?" or "how many at a time?"
Wikipedia
Distributive number
Distributive numbers versus multipliers
Distributive numbers
singly
doubly
triply
Multipliers
single
double
triple
In linguistics, more precisely in traditional grammar, a distributive number is a word that answers "how many times each?" or "how many at a time?", such as singly or doubly. They are contrasted with multipliers. In English, this part of speech is rarely used and much less recognized than cardinal numbers and ordinal numbers, but it is clearly distinguished and commonly used in Latin and several Romance languages, such as Romanian.