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extra-

   Also found in: Medical 0.04 sec.
extra- or extro-
pref.
Outside; beyond: extraterritorial.
[Latin extr-, from extr; see eghs in Indo-European roots.]
extra-
prefix
outside or beyond an area or scope: extracellular, extraterrestrial [Latin]


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In addition, 69% of students in the course reported that they attended class more often because of the chance to obtain the points associated with the extra- credit quizzes.
The Use of Random Extra Credit Quizzes to Increase Student Attendance by Stromsnes, Wibecke / Journal of Instructional Psychology
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