A brand-new, fully revised edition of this outstanding resource for students in grades 6-10 includes hundreds of new words, abundant example sentences, lively f

The only alphabetical guide to the key concepts of grammar for students in middle school and beyond.

Contains over seventy thousand entries including 1,000 new words and their meanings.

A brand-new, fully revised edition of this outstanding resource for students in grades 6-9, with hundreds of new words, abundant example sentences, lively featu

Entries with definitions of basic scientific terms are accompanied by illustrations, "Did You Know" sidebars, and explanatory notes.