Noun
(hunting, sometimes followed by on or for to designate the kind of animal hunted) A period of time during the calendar year when authorities within a jurisdiction permit the unrestricted hunting of one or more kinds of animal wildlife.
(figuratively, often followed by on or for) A situation in which someone is endangered, blamed, harassed, or opposed in a sustained manner by a number of others; a situation in which something is endangered or otherwise opposed.
(idiomatic, often followed by on or for) A situation or period in which some activity is routinely carried on.
Source: en.wiktionary.orgAnd you’ll be able to enroll in FEDVIP during the 2018 Federal Benefits Open Season, which runs from November 12th to December 10th. Source: Internet
Open Season: Third Saturday in April through last day in February. Source: Internet