Alee and At once

Alee adverb - On or toward the lee.

At once and alee are semantically related. In some cases you can use "At once" instead an adverb "Alee".

At once adverb - Without delay or hesitation; with no time intervening.

Alee and at once are semantically related. Sometimes you can use "Alee" instead an adverb phrase "At once".