launch window

WordReference Random House Unabridged Dictionary of American English © 2026

launch′ win′dow, 

1. Aerospace a precise time period during which a spacecraft can be launched from a particular site in order to achieve a desired mission, as a rendezvous with another spacecraft. Also called window. 

• 1960–65

Collins Concise English Dictionary © HarperCollins Publishers::

launch window noun

1. the limited period during which a spacecraft can be launched on a particular mission