let know

verb

"let-know" is a 7-letter English headword indexed on PlainSpell.

The verdict

“let know” is uncommon English (outside the top frequency list), classed as a verb. The kind of spelling people second-guess.

Unranked
below top-frequency English
8
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - To inform (someone) (of something).

Corpus desk

Index EN-let-know · let know · English

let know · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-LONG 8 letters
  • VOW-2 2 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "L" thin
  • PHOTO-UNK Peer pending

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Key facts for let know
PropertyValue
Headwordlet know
LanguageEnglish
Part of speechVerb
Letters8
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “let know” in English

let knowranks outside the top 100,000 English headwords, in the long tail of specialist, archaic, or seldom-used vocabulary, exactly the territory where a reader stops mid-sentence to double-check spelling.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

let know is uncommon English outside the top frequency list, classed as averb. Rarity is why readers land here mid-draft. Gloss: "To inform (someone) (of something).".

Our edit-distance generator produced no likely misspellings for let know, which points to an orthography that plays by predictable English rules. This entry stands alone in our confusable dataset, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

This entry carries no recorded etymology, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct English form is let know, spelled L-E-T- -K-N-O-W.

Definition

  1. 1
    To inform (someone) (of something).

Recorded use

Wiktionary examples

These source excerpts show how let know appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. I sent an email to let John know what we found.
  2. Let me know when you are arriving.

This word in other languages

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "let know"?
"let know" is spelled L-E-T- -K-N-O-W.
What does "let know" mean?
As a verb, "let know" means: To inform (someone) (of something).
What language does "let know" come from?
"let know" is a English word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list