![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png)
Look up keyspace in Wiktionary, the free dictionary.
The word key space (or keyspace) is used in
- Key space (cryptography) for an algorithm refers to the set of all possible keys that can be used to initialize it
- Keyspace (distributed data store), an object in NoSQL data stores that can be seen as a schema in RDBMS databases