This is the 621st most frequent Estonian word.
miljardit
"Miljardit" in English means "billions" (partitive case in Estonian).
Here, 'miljardi' is in the singular genitive case as part of a temporal expression indicating duration.
Kahe miljardi aasta pärast võib Päike hämarduda.
In two billion years, the Sun may dim.
The word 'miljardi' is used here as a quantifier in the genitive case to specify the number of people in relation to the numeral seven.
Maailmas elab üle seitsme miljardi inimese.
There are over seven billion people living in the world.
In this context, 'miljardeid' appears in the plural partitive case to indicate an unspecified but large quantity of billions.