English

keyspace

From key + space.

A compound of key + space

Proto-West Germanic *kaiju

Old English cǣġ ‘key’

Middle English keye ‘a key’

English key

Proto-Indo-European *(s)peh₂- ‘to stretch’

Latin spatium ‘space’

Old French espace ‘space’

Anglo-Norman space

Middle English space

English space

Today it means

noun The notional space that contains all possible cryptographic keys.

Language periods are conventional ranges, not dates for this word.

Etymograph / keyspace