What does "thirdly" mean?

In the third place; third in a row.

What is a synonym for "thirdly"?

Common synonyms include: in the third place, seventhly, third, third in order, third position.

/ˈθɚdli/ adv

adv ·Rare ·Advanced level

Adverb

1
In the third place; third in a row. not-comparable
"And God hath ſet ſome in the Church, firſt Apoſtles, ſecondarily Pꝛophets, thirdly Teachers, after that miracles, then gifts of healings, helpes in gouernmẽts, diuerſities of tongues."

Adverb

"Thirdly, if you don't put in the effort and challenge difficult things, there is nothing in the world at which you will succeed."

From third + -ly.