What does "uniqueness" mean?

The state or quality of being unique or one of a kind.

Uniqueness

Common synonyms include: singularity, authenticity, character, combination, creativity, data integrity requirement.

noun

noun ·3 syllables ·Uncommon ·College level

Noun

1
The state or quality of being unique or one of a kind. countable, uncountable
"In fact, the rebel flag is so prolific in the revival some musicians intentionally avoid using it not because of racially charged meanings but to affirm their own uniqueness and individuality as southern rockers."
2
the quality of being one of a kind wordnet

"We want to capture all the uniqueness of each language. And we as well want to capture their evolution through time."

From unique + -ness.