adjective . 1. without formality or ceremony; casual: an informal visit. 2. not according to the prescribed, official, or customary way or manner; irregular; unofficial: informal ...
Informal is a dress code, typified by a suit and necktie. On the scale of formality, informal attire is more formal than casual but less formal than semi-formal.
An informal fallacy is an argument whose stated premises fail to support their proposed conclusion. The deviation in an informal fallacy often stems from a flaw in the path of ...
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