1) ADJ: usu ADJ n If things are described or shown in chronological order, they are described or shown in the order in which they happened.

I have arranged these stories in chronological order.

Derived words:
chronologically ADV ADV after v, ADV -ed/adj

The exhibition is organised chronologically.

2) ADJ: ADJ n If you refer to someone's chronological age, you are referring to the number of years they have lived, in contrast to their mental age or the stage they have reached in their physical or emotional development. [FORMAL]

English dictionary. 2008.