dɪˈvaɪdə(ɹ) pɑɹˈtɪʃən a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements a vertical structure that divides or separates (as a wall divides one room from another) a person who separates something into parts or groups a taxonomist who classifies organisms into many groups on the basis of relatively minor characteristics