This is a great way to broaden student vocabulary. Intended for use in centers or rotations, this activity correlates with Common Core for Grades 9-10 (CCSS.ELA-Literacy.L.9-10.4c Consult general and specialized reference materials (e.g., dictionaries, glossaries, thesauruses), both print and digital, to find the pronunciation of a word or determine or clarify its precise meaning, its part of speech, or its etymology.)
The length of time that you use this activity is up to you. I prefer to use this activity for the first half of the first term, and then move on to other Common Core standards for vocabulary building.
You will need to create examples for your students, and be sure to have two or three dictionaries available at the center.
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