An indefinite continued progress of existence and events in the past, present, and future.

A particular period during which something happens.

एक विशेष अवधि

English Usage: We will meet at that time.

Hindi Usage: हम उस समय मिलेंगे।

Originating in the distant past; very old.

अति प्राचीन

English Usage: The traditions have been passed down since time immemorial.

Hindi Usage: ये परंपराएँ अति प्राचीन समय से चलती आ रही हैं।

For a time so long that it cannot be measured.

इतना समय कि उसका माप नहीं किया जा सकता।

English Usage: He has known her since time immemorial.

Hindi Usage: वह उसे अति प्राचीन समय से जानता है।