副词

1. 正如预期地;正如要求地
If you say that something duly happened or was done, you mean that it was expected to happen or was requested, and it did happen or it was done.

2. 适当地;恰当地
If something is duly done, it is done in the correct way.

1. at the proper time

e.g. she was duly apprised of the raise

Synonym: punctually