Language Of Temporal Ordering Specification(LOTOS) A formal {specification language} based on temporal ordering used for {protocol} specfication in {ISO} {OSI} {standard}s. It is published as ISO 8807 in 1990 and describes the order in which events occur. ["The Formal Description Technique LOTOS", P.H.J. van Eijk et al eds, N-H 1989]. (1995-03-18)