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From https://www.lot.com/cy/en/conditions-of-carriage (mirror), the term "sequence" designates the order of the flight coupons:
The carrierβs fares require that the passenger should travel the respective journey segments in the sequence in which they are reflected in the ticket. If the passenger intends to travel disregarding the original sequence of journey segments, he/she should change his/her ticket in accordance with his/her actual journey intention.
The document on the Main terms used in civil aviation statistics by the ICAO (mirror) defines a flight stage as follows:
Flight stage. A flight stage is the operation of an aircraft from take-off to its next landing. A flight stage is classified as either international or domestic based on the following definitions: [...].