The more extensive your vocabulary, the better your chances for success, other things being eaqual--success in attaining your educational goal, success in moving ahead in your business or professional career, success in achieving your intellectual potential.
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Increasing your vocabulary does not mean merely learning the definitions of large numbers of obscure words; it does not mean memorizing scores of unrelated terms. What it means--what it can only mean--is becoming acquainted with the multitudinous and fascinating phenomena of human existence for which words are, obviously, only the verbal description.