plural of observancy

plural of pilot balloon observation

An area of a tall building, often open to the sky, from which the public may look at the surrounding panorama. / A building (such as a hide) from which people may observe wildlife.

Learning that occurs as a function of observing, retaining and, in the case of imitation learning, replicating novel behavior executed by other people.

(astronomy) The extent of a universe within the cosmological horizon of an observer.

plural of observable universe

a lookout or vantage point

Ferris wheel

plural of observation wheel

plural of observation car