singularly, singularity

Singularly or singularly means uniquely or exceptionally--
He seemed singularly indifferent to the shocking news; that's suspicious.
Our chief suspect is singularly proficient at anything devious.

Singularly, as a grammar term, decribes using a word that corresponds to one person, place, or thing, instead of more than one--
Can you conjugate the verb both plurally and singularly?
Plurally, it's "they run"; singularly, it's "he runs".

Singularity or singularity means a unique or unusual quality, or the fact of being exceptional or unique--
He has the singularity of being able to hear a pin drop.
This place has a singularity; the locals claim that water flows uphill.

Now that you know that, you can say--
"His use of language has a singularity; all verb forms are the same, plurally and singularly."

Note--"singly" means one at a time or separately--
Now march out singly, one after another.