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5. t minus zero
Time to go, i.e. liftoff or the beginning of an operation.
T minus zero, time to leave...
1. T minus zero
"T minus zero" means "out of time."

This comes from a countdown convention used in by both the American military and NASA.

Generally, it is used when counting down to a major event that will happen at a specific time.

Mathematically, T is time, minus whatever amount of time is left until the event happens.

If the News Years ball is dropping in 10 minutes, one could say "The ball is dropping in T minus 10 minutes and counting!"

Therefore, "T minus zero" means that there is no time left.
I was working on my term paper all night for my morning class, and all the sudden I looked up at the clock and realized I was t minus zero.
2. t minus zero
The termination of a countdown. Afterwards, time is denoted by 't plus <amount of time>'
We are at t minus zero. We have ignition and liftoff.
3. t minus zero
What Mission Control in the Houston Space Center never says. They stop after T Minus 1 because T Minus zero is not significant in the countdown.
T Minus 5,4,3,2,1,0...o theyre already gone!