Acclimatisation is valid Scrabble Word

Is acclimatisation a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is acclimatisation valid Words with Friends?
Words with Friends YES

Definitions for ACCLIMATISATION in dictionary:

Similar words containing ACCLIMATISA without suffix tion

acclimatisable22
Find what other words can be done using letters: "acclimatisation"
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