Obviate v. t. : To meet in the way.

Obviate v. t. : To anticipate; to prevent by interception; to remove from the way or path; to make unnecessary; as, to obviate the necessity of going.

Example:
if Marijuana were legal, would it Obviate alcohol and tobacco?

Taxonomy
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Defination from the web:
Obviate - Definition of Obviate at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Obviate. Word of the Day and Crossword Puzzles. ... etc.) by effective measures; render unnecessary: to obviate the risk of serious injury. ... obviate ...