It's often used in scientific and technical contexts to indicate a relationship to time, such as:
* Chronology: The arrangement of events in time.
* Chronometer: A precise timekeeping instrument.
* Chronograph: A watch with a device for measuring short time intervals.
* Chronobiology: The study of biological rhythms.
* Chronometric: Relating to the measurement of time.
So, whenever you see "chrono-" in a word, it's a good indication that the word has something to do with time!