What is the meaning conveyed by the morpheme chron in each or these words chronology chronicle chronic chronogram?

The morpheme "chron" in these Words relates to time. "Chronology" refers to arranging events in order of occurrence, "chronicle" is a factual written account of events in chronological order, "chronic" pertains to a long-lasting condition, and "chronogram" is a phrase or inscription in which a set of letters stand for a date.