(Latin: borrowed from Old French saison, seison, "a sowing, planting", from Latin sationem, "a sowing"; also in Latin, "time of sowing, seeding time.")

breeding or mating season (s) (noun), breeding or mating seasons (pl)
The period of time when animals, birds, etc, are producing young ones.
holiday season (s) (noun), holiday seasons (pl)
Usually the time from late November through January: Holiday seasons involve Christmas, Hanukkah, and New Year's eve which take place during this period.
season (s) (noun), seasons (pl)
1. One of the four periods of a year: This includes the seasons spring, summer, autumn, and winter.
2. Any period of time marked by something special: Examples include a holiday season or a harvest season.
3. A time when something is occurring, is active, is at its best, or is in fashion: The baseball season or the theatrical season are two examples.
4. Etymology: from Latin sationem, "a sowing" and from serere, "to sow".
season ticket (s) (noun), season tickets (pl)
A pass or ticket that entitles the holder to have certain privileges for a specified time: Jim and his wife had season tickets for a series of concerts and modern musicals.
seasonable (adjective), more seasonable, most seasonable
1. A reference to being suitable for a period of time: In the Northern Hemisphere, hot weather is seasonable in July.
2. Relating to something that comes at the right or proper time: The government of the flooded area brought seasonable aid to the victims who suffered from the damaging of the excessive water.
3. Etymology: from Latin satio, "act of sowing", a derivative of satus, from serere, "to sow, to plant."
seasonably (adverb, more seasonably, most seasonably
1. Descriptive of being normal for a certain time of the year: Some areas have been having seasonably cool weather while others have abnormally warm conditions.
2. Etymology: from Latin satio-, "a sowing, a seedtime".
seasonal (adjective), more seasonal, most seasonal,
Characteristic of times that happen at regular intervals: There are seasonal periods that happen during variations in the weather or seasonal workers who are hired during the holidays.
seasonality (s) (noun), (no plural)
At various times or in a series of data, the presence of variations that occur at specific regular intervals in less than a year; such as, weekly, monthly, or quarterly: Seasonality may be caused by various factors; such as, weather, vacations, or holidays and it consists of periodic, repetitive, and generally regular and predictable patterns in the levels of a series in times.

Some people track the seasonality of rainfall levels or snow levels, etc. during certain times of the year.

seasonally (adverb), more seasonally, most seasonally
1. Pertaining to one of the periods into which a year is naturally divided as marked by its temperature, moisture, etc.: The seasonally times of spring, summer, autumn, and winter are variations of wet and dry climates.
2. Conveying that part of the year when particular trades, professions, or businesses have the greatest activities: Christmas is one of the more seasonally active times for sales of products by stores.

Some restaurants seasonally change their menus at various times.

3. Etymology: from Latin satio, sationis, "a sowing" from sero, satum, "to sow".
seasoner (s) (noun), seasoners (pl)
1. Someone who or that which takes place at the right time.
2. Something added to food primarily for the savor it produces.
seasoning (s) (noun), seasonings (pl)
1. Salt, herbs, or spices added to food to enhance the flavor: Jim's wife added a dash of lemon juice and spices as seasonings to the soup she was preparing.
2. The process of adjusting the moisture content of wood to make it more suitable for use as timber: The outdoors may be notably drier during the intermediate stages of seasoning by nature.
unseasonable (adjective), more unseasonable, most unseasonable
A reference to not being agreeable or consistent with the time of the year.
unseasonably (adverb), more unseasonably, most unseasonably
Not at the most suitable time: The weather where Tom lives is unseasonably cold while where his brother lives is unseasonably warm.