We found one dictionary that defines the word second powers:

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1. second powers: Vocabulary.com

(Note: See second_power as well.)

Definitions from WordNet (second power) ▸ noun:  the product of two equal terms ("Nine is the second power of three") ▸ Also see second_power ▸ Words similar to second powers ▸ Usage examples for second powers ▸ Idioms related to second powers ▸ Wikipedia articles (New!) ▸ Words that often appear near second powers ▸ Rhymes of second powers ▸ Invented words related to second powers