Lastly definitions

lastlē
Lastly is defined as finally or happening after everything else.

The words you say before the last point mentioned in a speech is an example of lastly; "and lastly..."

adverb
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In conclusion; finally.
adverb
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(sequence) Used to mark the beginning of the last in a list of items or propositions.

Firstly, that's illegal; secondly, it has serious disadvantages; thirdly, it's not necessary; and lastly, did I mention that it's illegal?

adverb
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(discourse marker) Used to signal that the speaker is about to yield control of the conversation.
adverb
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Origin of lastly

From last +"Ž -ly.