Fetching details from the dictionary...

first of all; at once; right away
for now; for the time being; tentatively
anyway; at least
取り敢えずビールをお願いします。
I'll have a beer for starters, please.
取り敢えず報告だけしておきます。
I'll just make a report for now.
取り敢えず安全を確認してください。
First of all, please confirm it's safe.