This word is acceptable for play in the UK dictionary that is being used in the following games:

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n. The act of instilling; also, that which is instilled.

n. the introduction of a liquid (by pouring or injection) drop by drop

"The instilment thereof into her mind would probably have caused this aged sister to drop down dead, at once, as by the effect of an intensely poisonous infusion."

insertion    intromission    introduction   

infusion   

instalment