Webster's Online Dictionary
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Definition: DEMONSTRATER

Part of Speech Definition
Noun 1. An alternative spelling for "Demonstrator": One who demonstrates; one who proves anything with certainty, or establishes it by indubitable evidence.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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"Demonstrater" is a common misspelling or typo for: demonstrated.

Date "Demonstrater" was first used in popular English literature: sometime before 1914. (references)

Definition: DEMONSTRATER

Part of SpeechDefinition
Noun1. An alternative spelling for "Demonstrator": One who demonstrates; one who proves anything with certainty, or establishes it by indubitable evidence.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "DEMONSTRATER" was first used in popular English literature: sometime before 1914. (references)