following in order of time or place sequential data processing Word Origin early 19th cent. (as a medical term in the sense ‘following as a secondary condition’): from sequence, on the pattern of consequential.Extra examples A list of keys in sequential order is fed into the program. A sequential pattern of elements can be detected in the symbols. More demanding than the panel interview is the sequential interview. The buying process is analysed as a series of sequential steps. The organization of the chapters is sequential.