A rudimentary building used by people making field observations.

plural of observation hut

(military) A type of balloon that is employed as an aerial platform for intelligence gathering and artillery spotting.

plural of observation balloon

(social sciences) A research methodology used in some social sciences to gain familiarity with a group of individuals and their practices through an intensive involvement, usually over an extended period of time.

A style of comedy based on observations about everyday life.

plural of observational error

(statistics) The difference between a measured value of a quantity and its true value.

(humorous) A variation of Murphy's law, which states that the other line (such as at a stand or a store) always moves faster.

(humorous) A variation of Murphy's law, which states that the other line (such as at a stand or a store) always moves faster.