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'At a time' or 'in a time'

English Language & Usage Asked on July 25, 2021

In the phrase

The quantity of insects in/at a time t is given by i(t).

What is the correct?

Thank you so much!

One Answer

At

In your example “at a time” would refer to a particular moment or an instant in which we want the number of insects.

“In a time” would refer to a duration of time at the end of which we are calculating the number of insects.

I think you mean to use the former version, therefore “at a time” is what is correct according to me.

Correct answer by Natru on July 25, 2021

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