Use stoa in a sentence. pl. stoâ²ae or stoâ²as. a portico, as in ancient Greece, having a wall on one side and pillars on the other. Origin of stoa.
Definition of classify for English Language Learners. : 1  to arrange (people or things) into groups based on ways that they are alike. : 2  to consider (someone or something) as belonging to a particular group.
Chemical classification means finding out how the chemicals you supply can harm you, others or the environment. Classification is very important and provides the starting point for the controls needed to protect us and the world we live in. These pages provide an introduction to the basics of classification and where you can find detailed help and advice.