The state of being unknown; a thing that is unknown.
The quality of being difficult to understand; a thing that is difficult to understand.
Darkness; the absence of light.
The number of significant digits to which a value may be measured reliably.
The ability of a measurement to be reproduced consistently.
A bidding system that makes use of many artificial bids to describe a hand quite precisely.
The state of being precise or exact; exactness.
Made, or characterized by accuracy.
Used for exact or precise measurement.