The term "open season" has a few different meanings depending on its context. Generally, it refers to a period when something is allowed or permitted without restrictions. Here are some common definitions and uses of the phrase:
1) In hunting, open season refers to a specific time during which certain animals can be legally hunted. During this time, there are no limits on taking these particular species.
2) In business, open season may refer to a period when employees can enroll in or change their benefits packages without restrictions.
3) In politics, an "open season" is often used to describe a situation where politicians and pundits attack each other with no holds barred, usually during election campaigns.
4) Finally, the phrase may also be used more generally to refer to any period of time when something is allowed or permitted without restrictions, regardless of context.