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What's the "een" in Halloween?

substitutive

[suhb-sti-too-tiv, -tyoo-] /ˈsʌb stɪˌtu tɪv, -ˌtyu-/
adjective
1.
serving as or capable of serving as a substitute.
2.
pertaining to or involving substitution.
Origin
1590-1600
1590-1600; substitute + -ive
Related forms
substitutively, adverb
nonsubstitutive, adjective
unsubstitutive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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