I UK [ˈaʊə(r)lɪ] / US [ˈaʊrlɪ] adjective
1) happening once every hour

hourly news bulletins

2) [usually before noun] relating to one hour of work

His hourly fee is £50.

We charge clients on an hourly basis.

II UK [ˈaʊə(r)lɪ] / US [ˈaʊrlɪ] adverb
1) once every hour

Buses run hourly.

2) someone who is paid hourly is paid an amount of money for each hour of work
3) often, or all the time

The situation is changing hourly.

English dictionary. 2014.