"Prefixion" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) No

"prefixion" Definition

  1. [obsolete] a fixing or appointing beforehand :preappointment
  2. the placing of a word or particle before and usually in combination with a word

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