Princeton's WordNet

1. grader(noun)

   a judge who assigns grades to something

Kernerman English Learner's Dictionary

1. grader(noun)ˈgreɪ dər

   a student in the second/fourth/fifth etc. grade in a U.S. school

Wiktionary

1. grader(Noun)

   A machine used in construction for flattening large surfaces

2. grader(Noun)

   One who grades, or that by means of which grading is done or facilitated.

3. grader(Noun)

   One who belongs to a certain grade at school.

   A first grader.

Webster Dictionary

1. Grader(noun)

   one who grades, or that by means of which grading is done or facilitated

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