Merriam-Webster's® Intermediate Dictionary Hardcover
Mid-level for intermediate readers
Illustrated dictionary features nearly 70,000 entries, including 22,000 example sentences and phrases. Abundant word history and synonym paragraphs. Hardcover. IL: 6–8. 1,024 pages.
Common Core Standard for Vocabulary Acquisition and Use:
CCSS.ELA-Literacy.L.6.4d Verify the preliminary determination of the meaning of a word or phrase (e.g., by checking the inferred meaning in context or in a dictionary).