What does "fourthly" mean?

In the fourth place; fourth in a row.

What is a synonym for "fourthly"?

Common synonyms include: additionally, fourth, furthermore, moreover.

adv

adv ·2 syllables ·Rare ·Advanced level

Adverb

1
In the fourth place; fourth in a row. not-comparable
"Fourthly, I have made an effort to call the attention of the reader to the pertinent literature."

Adverb

"Fourthly, my first three points do not exist."

From fourth + -ly.