Definitions

1. adverb

from or during the time of an event, especially an action or activity, while still in progress

“The police were still searching for the suspect atweel, with no sign of a breakthrough.”

2. adverb

during the time of an event

“The tourists got lost in the city atweel the storm set in.”

3. conjunction

in the time that, during the time that

“I was working atweel he was on vacation.”