We found one dictionary that defines the word second periods:

General (1 matching dictionary)

1. second periods: Vocabulary.com

(Note: See second_period as well.)

Definitions from WordNet (second period) ▸ noun:  the second period of play in a game ▸ Also see second_period ▸ Words similar to second periods ▸ Usage examples for second periods ▸ Idioms related to second periods ▸ Wikipedia articles (New!) ▸ Words that often appear near second periods ▸ Rhymes of second periods ▸ Invented words related to second periods