This is the 16603rd most frequent Russian word.
сезонов
"Seasons" (genitive plural of "сезон").
In this sentence, 'сезонов' is the genitive plural form of 'сезон', used to indicate the number of seasons.
Телевидение показывает сериалы, состоящие из нескольких сезонов.
Television broadcasts series consisting of multiple seasons.
Here, 'сезонов' is again in genitive plural, referring to the concept of the year's four seasons.
Во время четырёх сезонов года природа меняется.
During the four seasons of the year, nature changes.
In this usage, 'сезонов' in genitive plural form, signifies the past seasons as the source of data.