Definitions for "Run-on sentence"
or comma splice is an error in which two independent clauses are joined without the proper punctuation.
a sentence that goes on beyond the point where it should have stopped. The term covers both the comma splice (two sentences joined by a comma) and the fused sentence (two sentences joined without any punctuation between them).
an ungrammatical sentence in which two or more independent clauses are conjoined without a conjunction
a usual mistake of children who begin learning writing