Inhalation

google

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early 17th century: from medieval Latin inhalatio(n- ), from inhalare ‘inhale’.

wiktionary

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inhale +‎  -ation

etymonline

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inhalation (n.)

1620s, "a breathing in," noun of action from past participle stem of Latin inhalare "breathe upon" (used here as if it meant "to breathe in"), from in- "on, upon" (from PIE root *en "in") + halare "breathe."