This is the 14th most frequent Estonian word.
kui
The Estonian word "kui" means "if," "when," or "than," depending on context.
The word 'kui' is used as a conjunction to mean 'when' in temporal clauses.
Elu on parem, kui sa naeratad.
Life is better when you smile.
The word 'kui' functions as a conjunction meaning 'if' in conditional sentences.
Kui vihma sajab, jääme koju.
If it rains, we will stay at home.
The word 'kui' is used here as a comparative particle, meaning 'than'.