a division in a system, order or type of group

classification, type

the scientific study of how substances (elements) are made up, how they combine, how they act under different conditions

arrangement, arranging

the process of classifying or being classified

categorization

something that is formed; a (style of) structure or arrangement

composition, establishment

a step, stage or degree in development

classification, step

a step, stage or degree in rank, quality, value etc; a mark (e.g. 80%) or rating (e.g. 'Excellent' or 'Fair') given to a student for work done

rank, step

an organization with grades of authority from lowest to highest

order

the careful way in which things are placed in relation to one another; a request to supply goods; a written instruction (especially to a bank or post office) to pay money, or giving authority

arrangement, organization

the act of organizing; an organized group of people (e.g. a business); organized system

arrangement, arranging

a connected series of events, ideas etc

series, order

one of a set of rows (especially of seats) parallel to and rising one above another, e.g. in a theatre or stadium

level