This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. Used to mark the beginning of the last in a list of items or propositions.

ad. Used to signal that the speaker is about to yield control of the conversation.

ad. In the last place; in conclusion.

ad. at last; finally.

In the last place.

At last; finally; in the end.

ad. the item at the end

"Thirdly, and lastly, as your father says -- though not very often, "added Turkey slyly, meaning that the _lastly_ seldom came with the _thirdly_, --" if we take the honey now, the bees will have plenty of time to gather enough for the winter before the flowers are gone, whereas if we leave it too long they will starve. ""

finally    to conclude    in the end    at last    last    ultimately    all in all    to sum up    in conclusion    last of all   

Astley    ghastly    vastly