ADR meaning in Community ?

Dubbing, mixing or re-recording, is a post-production process used in filmmaking and video production in which additional or supplementary recordings are lip-synced and "mixed" with original production sound to create the finished soundtrack.

The process usually takes place on a dub stage. After sound editors edit and prepare all the necessary tracks – dialogue, automated dialogue replacement (ADR), effects, Foley, music – the dubbing mixers proceed to balance all of the elements and record the finished soundtrack. Dubbing is sometimes confused with ADR, also known as "additional dialogue replacement", "automated dialogue recording" and "looping", in which the original actors re-record and synchronize audio segments.

Outside the film industry, the term "dubbing" commonly refers to the replacement of the actor's voices with those of different performers speaking another language, which is called "revoicing" in the film industry. The term "dubbing" is only used when talking about replacing a previous voice, usually in another language. When a voice is created from scratch for animations, the term "original voice" is always used because, in some cases, this media is partially finished before the voice is implemented. The voice work would still be part of the creation process, thus being considered the official voice.