firstly

As a letter s

is the letter s with a.

As an adverb firstly is

(formal) in the first place; before anything else; first.

As an adverb firstly

is (formal) in the first place; before anything else; first.

As a noun null is

zero, nil; the cardinal number before einn.

As an adverb firstly

is (formal) in the first place; before anything else; first.

As a letter x is

the twenty-fourth letter of the.

As a symbol x is

voiceless velar fricative.

As a proper noun foremost

is a village in alberta, canada.

As an adverb firstly is

(formal) in the first place; before anything else; first.

As an adverb firstly

is in the first place; before anything else; first.

As a noun priority is

an item's relative importance.

As adverbs the difference between originally and firstly

is that originally is as it was in the beginning while firstly is (formal) in the first place; before anything else; first.

As adverbs the difference between certainly and firstly

is that certainly is in a way which is certain; with certainty while firstly is (formal) in the first place; before anything else; first.

As adverbs the difference between firstly and lastly

is that firstly is (formal) in the first place; before anything else; first while lastly is (sequence).

As adverbs the difference between firstly and early

is that firstly is (formal) in the first place; before anything else; first while early is at a time before expected; sooner than usual.

As an adjective early is

at a time in advance of the usual or expected event.

As a noun early is

a shift (scheduled work period) that takes place early in the day.

As adverbs the difference between newly and firstly

is that newly is in a new manner while firstly is (formal) in the first place; before anything else; first.