Putting something in "chronological" order means putting it in order by time. This means arranging the items or events in the order in which they occurred, from earliest to latest. For example, if you were sequencing a series of historical events, you would arrange them in chronological order based on the dates on which they occurred. Similarly, if you were sequencing a series of steps in a process, you would arrange them in chronological order based on the order in which they need to be performed. Chronological order is an important concept in many fields, including history, science, and literature.