Definition of "AIM"

(ESA, space science) Initialism of Asteroid Impact Mission.  examples

(Internet, historical, 1997–2017) Initialism of AOL Instant Messenger.

(NASA, space science) Initialism of Aeronomy of Ice in the Mesosphere, a NASA satellite.  examples

(UK, finance) AIM, the secondary stock market of the London Stock Exchange; formerly an initialism of Alternative Investment Market.  examples