Wiktionary defines readback as follows: (1) (Computing) The act of reading data back from a location where it has been stored. (2) (Aviation, telecommunications) The repetition of a message one has received, in order to acknowledge it. (3) The reading aloud by a court reporter or stenographer of testimony previously taken down in stenographic dictation, usually at the request of the presiding judge or parties involved in a deposition.”
Here are some examples for how they should be used:
We have a while left before the train arrives.
I saw my friend a while ago.
We waited awhile for the bus.
She ran awhile.
Here’s a trick that usually works: If you can use “for a while” as a substitute, then using “awhile” will likely be the right choice when choosing between, “a while” and “awhile.”
a while= AEU/WHAOIL