n. In ancient Greece, particularly at Athens, a form of personal service to the state which citizens possessing property to a certain amount were bound, when called upon, to perform at their own cost.n. A form or method of conducting public worship; an appointed form for the words and acts used in the rites and ceremonies of the Christian church.n. Specifically, in liturgiology, and as the name most frequently used in the Greek Church, the form of service used in the celebration of the eucharist, or that service itself.