Semifactorial

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Synonym of double factorial. rare

    "With the symbol n#33;#33; we indicate the semifactorial of n, that is the product 1.3.5#92;dotsn if n is odd, and the product 2.4.6#92;dotsn if n is even."

Synonyms

All synonyms
double factorial

Example

More examples

"With the symbol n#33;#33; we indicate the semifactorial of n, that is the product 1.3.5#92;dotsn if n is odd, and the product 2.4.6#92;dotsn if n is even."

Etymology

From semi- + factorial.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.