installfest in English dictionary installfest Meanings and definitions of "installfest" (computing) An event where experienced users assist others with installing an operating system on their computers. noun (computing) An event where experienced users assist others with installing an operating system on their computers. more Grammar and declension of installfest installfest ( plural installfests) installfest (plural installfests) more Sample sentences with "installfest" Declension Stem Try again Authors