We found one dictionary that defines the word siderations:

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1. siderations: Collins English Dictionary

Opposite: Unfortunately ▸ Words similar to siderations ▸ Usage examples for siderations ▸ Idioms related to siderations ▸ Wikipedia articles (New!) ▸ Words that often appear near siderations ▸ Rhymes of siderations ▸ Invented words related to siderations