English

i+1

Containing only a single word unknown to the listener or reader.

    Etymology graph

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    Origin

    Ostensibly coined by Stephen Krashen in his Explorations in Language Acquisition and Use in 2003; but possibly earlier. Originally, referred to a subsequent word (the 1) added to an existing vocabulary of i words, i.e. the i+1th word learned by the learner.

    From Wiktionary, CC BY-SA 4.0.

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