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This article discusses the effects of repetition (1, 3, 7, and 10 encounters) on word knowledge in a carefully controlled study of 121 Japanese students learning English. The study is innovative and original in several aspects. (1) The study uses 10 tests to measure knowledge of orthography, association, grammatical functions, syntax, and meaning and form. (2) The study controls for several different numbers of repetitions. (3) The study controls for type of context in which the word occurs. (4) The study makes use of nonsense words to replace frequently used words in authentic text. (5) The study examines word knowledge acquisition at different levels. The results showed that greater gains in knowledge were found for at least one aspect of knowledge each time repetitions increased. If learners encounter unknown words ten times in context, sizeable learning gains may occur. However, to develop full knowledge of a word more than ten repetitions may be needed.
