Definition of "third-grader" [third-grader]

• Someone who is in third grade (noun)
• An immature person. (noun)

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• "Here's attempt number three, in response to a question from a third-grader:"
• "She couldn't do it in the vice presidential debate against Joe Biden, she couldn't do it during a post-debate softball interview on Fox News Channel and she couldn't do it when interviewed by a third-grader."
• "He has for the past year taught a cooking class at P.S. 3 in the West Village, where his son is a third-grader."