Ka-vi-fe was a concept within Vulcan society which meant "challenge" and was used between two members of the race during melee combat.

Savaj and Spock entered into the ka-vi-fe by the Designers who sought to understand the nature of the aggression during the 23rd century. (TOS novel: The Prometheus Design)

This form of ritual challenge may be distinct from the kal-if-fee, or it could be simply an alternate spelling.

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