/ ˈlɑːstli; NAmE ˈlæstli/ adverb
1.
used to introduce the final point that you want to make
SYN finally :
Lastly, I'd like to ask you about your plans.
2.
at the end; after all the other things that you have mentioned :
Lastly, add the lemon juice.
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WHICH WORD
lastly / at last
Lastly is used to introduce the last in a list of things or the final point you are making:
Lastly, I would like to thank my parents for all their support.
At last is used when something happens after a long time, especially when there has been some difficulty or delay:
At last, after twenty hours on the boat, they arrived at their destination.
You can also use finally , eventually or in the end with this meaning, but not lastly .