A moment or event occurring right now.

अभी

English Usage: He gave an instantaneous response to the question.

Hindi Usage: उसने सवाल का तुरंत उत्तर दिया।

Referring to a very short period of time.

Occurring or done immediately or without delay.

Having a very brief duration.

क्षणिक

English Usage: His instantaneous decision shocked everyone.

Hindi Usage: उसका क्षणिक निर्णय सभी को चौंका दिया।

In a way that is immediate.

At once or immediately.

एक साथ

English Usage: He responded instantaneously to the email.

Hindi Usage: उसने ईमेल का एक साथ उत्तर दिया।