alternately
In reciprocal succession; succeeding by turns; in alternate order.
Example
“Driving downtown is restricted to bikes with odd and even license plate numbers alternately by day of the month.”
Other meanings
By alternation; when, in a proportion, the antecedent term is compared with antecedent, and consequent.
Where this comes from
This definition is adapted from “alternately” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.