the quality of being one of a kind
"that singularity distinguished him from all his companions"
strangeness by virtue of being remarkable or unusual
"The singularity of her decision to quit her job on a Tuesday shocked everyone at the office."
The state of being singular, distinct, peculiar, uncommon or unusual.
"Her singularity in solving such a complex puzzle without any prior training left everyone in awe."
The technological singularity (sometimes capitalized in this manner when referred to as an era or event).
"Many futurists argue that we are approaching the technological singularity, a point where artificial intelligence will advance so rapidly it becomes indistinguishable from human consciousness."
The word "singularity" comes from the Latin term singulāritās, which means "singleness." It entered English through Middle English and Old French before evolving to describe a state of being single or unique.