the process of classifying or being classified

categorization

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

a line of people waiting for their turn (e.g. to enter a cinema, get on a bus); a line of vehicles waiting to proceed

sequence

a number of people or things in a line; a noisy conversation, activity or disturbance

sequence, series

a small, flat-headed nail; a long, loose stitch used to fasten pieces of cloth together loosely or temporarily; a sailing-ship's direction described according to the direction of the wind and the position of the sails

course of movement

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

level