Window

A window was an opening.

During the Nestene's attempted invasion of Earth in the 1970s, Auton shop window dummies came to life, broke out of the windows and started killing people. (TV: Spearhead from Space)

In the 1920s, the Doctor met Nellie Melba and learned her party trick of shattering glass with a high-pitched note. The Fourth Doctor used it on Delta III to shatter a window, allowing rain to dampen vines constricting him, Romana I and Rohm-Dutt. (TV: The Power of Kroll)

During a night of unrest in Empire City, Elena Salcha and Tom Jakovv got drunk and made love on a waterbed in the smashed window of Tyack's Fittings. (PROSE: Tragedy Day)

A Tomorrow Window was a device invented by Astrabel Zar and Charlton Mackerel that allowed an individual to see their future. (PROSE: The Tomorrow Windows)

Time windows could be created by pushing energy into a warp drive, as was done on the SS Madame de Pompadour. (TV: The Girl in the Fireplace) The Doctor's TARDIS was also capable of opening time windows. (TV: Death Is the Only Answer)

When the newly regenerated Twelfth Doctor and Clara Oswald were staying with the Paternoster Gang, Strax delivered a copy of The Times by throwing it through a window, hitting Clara in the head. (TV: Deep Breath)

The Small Trianon was a building on the Braxiatel Collection that housed the Oracle of the Lost. It could be seen from Irving Braxiatel's bedroom window. (PROSE: Careless Talk)

Clyde Langer said that his lack of knowledge in chemistry was a result of watching the Park Vale Comprehensive School netball team through the window during his lessons. (TV: Sky)