*SET-U

English word origin

Etymology of i+1

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. t

1 source sectionExtended source reportWiktionary original ↗
In this entry · 1 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Unnumbered source etymology

Original entry ↗
noun

The existence of only one word unknown to the reader or listener of a sentence.

adj

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

Selected source glosses provide context, not a complete modern definition inventory

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.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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        "1": "en",
        "2": "Stephen Krashen",
        "nocap": "1"
      },
      "expansion": "coined by Stephen Krashen"
    }
  ],
  "links": [],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "The existence of only one word unknown to the reader or listener of a sentence."
      ],
      "tags": [
        "uncountable"
      ],
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      "rawRecordSha256": "495275bed48ff8032eaa5abf6c6b7d712e019fefda37152ab07e28c940e8320e",
      "sourceRecordOrdinal": 9783673
    },
    {
      "pos": "adj",
      "glosses": [
        "Containing only a single word unknown to the listener or reader."
      ],
      "tags": [
        "not-comparable"
      ],
      "recordId": "b23232453d6020c720b5d3ac573fe9cdd8050b1be1670c8f7eb477f01bb41a48",
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      "sourceRecordOrdinal": 9783672
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  "omittedAuxiliaryFields": {
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    "lexicalRecords": 0,
    "lexicalSenses": 0,
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Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for i+1 →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-aSsx