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Adjective: triweekly  trI'week-lee
  1. Every three weeks or three times a week
    "The magazine publishes new issues on a triweekly basis"
Adverb: triweekly  trI'week-lee
  1. Three times a week or every three weeks
    "He attends triweekly yoga classes to maintain his flexibility"

Encyclopedia: Triweekly