What is the meaning of seasons ?

1.each of the four divisions of the year (spring, summer, autumn, and winter) marked by particular weather patterns and daylight hours, resulting from the earth's changing position with regard to the sun. 2.
add salt, herbs, pepper, or other spices to (food). 3. make (wood) suitable for use as timber by adjusting its moisture content to that of the environment in which it will be used.

Four divisions of weather patterns (spring summer autumn winter)

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.