This document provides a list of terms with their definitions illustrated by typical photographs, in order to define a common vocabulary on the imperfections and damage that may occur during manufacture on organic matrix composite materials (which will be called "resin" along this document). Some types of damage may also be encountered in use. This standard is restricted to their definitions and does not give any acceptance criteria. The word "imperfection" will be preferred to the word "defect", although the word "defect" might be usually used.