Learning Vocabulary Through Reading

This study examined the hypothesis that new vocabulary knowledge can be acquired through incidental learning of word meanings from context. Fifth graders of two reading abilities read passages containing unfamiliar words. Students were randomly assigned to different numbers of context presentations: 0, 2, 6, or 10 passages read over several days. Half of the unfamiliar words were informally taught before their appearance in the passages. Word meanings were learned from context, and more frequent presentation in context increased learning. Also, better readers profited more from context than did less skilled readers, and prior exposure (informal teaching) resulted in greater learning. Vocabulary effects were also observed on a measure of reading comprehension. Whether incidental learning accounts for vocabulary growth is discussed.