a fact, thing etc used to represent a group of similar ones

instance, model

the process, state of illustrating or being illustrated; a picture, diagram, example etc used in a book etc

demonstration, exemplification

an example; fact or occasion etc supporting a general truth

case, situation

one of a number, part of a whole, used to show what the rest is like

example, model

one used as an example; a part taken to represent the whole

example, sample