What is the meaning of Jaar?

A year.

year

we (I and another, but not you)

year (the time it takes the Earth to circle the Sun; its equivalent on other planets)

year (the individuals associated with a year, notably the students in or graduates from an annual class at school)

their (third-person plural possessive determiner)

theirs (third-person plural possessive pronoun)

Source: wiktionary.org