Üheks
Üheks is the translative case form of the Estonian numeral üks (one). It is used to express a change of state, commonly in predicative constructions with verbs such as saama (to become) or jääma (to remain) when describing becoming or identity. The form literally conveys “into one” or “as one” and is a standard part of how Estonian marks transformation in grammar.
Grammatically, üheks is a translative form of a numeral and appears in contexts where a change of
Usage and examples are predominantly literary or formal. Typical phrases include ta sai üheks (he became one)
Semantic notes, dialects, and style: üheks carries a nuance of unity or fusion into a single state.
See also: Estonian language, Numerals, Translative case, Grammar of Estonian.