This document provides information on vocabulary acquisition and expanding one's vocabulary. It discusses that acquiring vocabulary requires understanding a word's definition and context, and is crucial for academic and language development. Studies show understanding 95% of words is needed for text comprehension. Expanding vocabulary takes careful instruction and practice over a lifetime. Various techniques are suggested for acquiring new words, including determination using flashcards and dictionaries, social interaction like group work, and memory techniques like semantic maps, imagery, and repetition in sentences. Cognitive methods involve keeping notebooks and using vocabulary sections in textbooks. Metacognitive strategies include continuing review over time and self-testing.