That opportunity has already passed; that cannot be undone.

Alternative form of that train has left the station

Used to ask for directions in order to go to a bus station.

Used to ask for directions in order to go to a train station.

(statistics) Of a random process X(t), having characteristics that do not change as t varies.

(mathematics) A point on a curve where the gradient is zero. This point can be a maximum, a minimum, or a point of inflection.

Writing materials, envelopes, office materials.

Misspelling of stationary.

Not moving. / incapable of being moved / unchanging

(obsolete, rare) One who, or that which, is stationary, such as a planet when apparently it has neither progressive nor retrograde motion. / Misspelling of stationery.