What Does Chronological Mean?

Chronological means arranging things or events in a sequence in the order of their occurrence. Thus they are arranged according to the dates of their happening in ascending or descending order. It is term derived from the word chronology. Chronology refers to the science of locating events in time. Thus it is a part of history. Being chronological in approach helps or assists to gather information and record it in an efficient manner which ensures that anybody referring to it at a future date would be able to comprehend it easily.

Arranging it chronologically might mean locating events relative to each other or locating them to specific dates in a chronological era. Thus it is nothing but an ordered sequence of events as per a timeline. Chronological age, chronological order, chronological record chronological succession etc are some of the term connected with the word "chronological".

When they are asking to list work history in chronological order,what does that mean?

Chronological means that you put things in proper oder in line not the other way round.