ETYM Greek, not following, wanting sequence; an priv. + keleuthos path, way.
Moving to new topic of discussion before finishing current one.
Grammar, lack of sequence; passing to a new subject, or sentence-construction, without completing first one.
(Greek “inconsistent”) In grammar, a written or, more commonly, spoken construction that breaks off before completion (“When I set out—no, before that . I’ll start again”).
A want of grammatical sequence or coherence in a sentence; an instance of a change of construction in a sentence so that the latter part does not syntactically correspond with the first part.