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Vocabulary does require some memorization, but a strategy I find most helpful is to learn prefixes, roots, and suffixes so you can dissect a word and figure out its definition.
By expanding your vocabulary, you can increase your communication and comprehension. A robust vocabulary can help you read, write, and speak with variety versus redundancy.
According to www.wordsmart.com, "An educated vocabulary can improve your public speaking skills." It increases audience attention and enables you to relay messages more effectively.