instant

A very short period of time; a moment.

"She paused for only an instant, which was just enough time for John to change the subject."

A single, usually precise, point in time.

"The instant the alarm went off, he fled the building."

A beverage or food which has been pre-processed to reduce preparation time, especially instant coffee.

A camera that uses self-developing film to create a chemically developed print shortly after the photograph is taken.

Impending; imminent.

Urgent; pressing; acute.

Insistent; persistent.

Present; current; extant.

At once; immediately.