sempiternity

Name: sempiternity, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

/ˌsɛmpɪˈtɜːnəti/

//ˌsɛmpɪˈtɜːnəti// noun

By PlainSpell Editorial Team · According to Wiktionary data (CC BY-SA) · analyzed May 6, 2026

The verdict

“sempiternity” is outside the top-ranked English vocabulary, used as a noun - the kind of word writers most often double-check.

Unranked
below top-frequency English: 12
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Existence within time but infinitely into the future, as opposed to eternity, understood as existence outside time.

Key facts for sempiternity
Property	Value
Headword	sempiternity
Language	English
Part of speech	Noun
IPA	/ˌsɛmpɪˈtɜːnəti/
Letters	12
Misspellings tracked	0
Confusable pairs	0
Source	Wiktionary (kaikki.org)

Where “sempiternity” sits in English frequency

sempiternity falls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

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

Spelling & Dictionary Insight

The English entry for sempiternity is 12 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˌsɛmpɪˈtɜːnəti/. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.

No generated misspelling entries exist for sempiternity in our index, since its letter sequence doesn't invite the usual edit-distance slips. No confusable counterpart is on file for this word, a sign it's visually distinctive enough not to be mixed up with another word.

Etymologically, the entry records: From sempitern(al) + -ity, from Latin sempiternitas. The correct English form is sempiternity, spelled S-E-M-P-I-T-E-R-N-I-T-Y.

Definition

1
Existence within time but infinitely into the future, as opposed to eternity, understood as existence outside time.
2
Eternity; a seemingly everlasting period of time.

Etymology

From sempitern(al) + -ity, from Latin sempiternitas.

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 "sempiternity"?

"sempiternity" is spelled S-E-M-P-I-T-E-R-N-I-T-Y. The IPA pronunciation is /ˌsɛmpɪˈtɜːnəti/.

What does "sempiternity" mean?

As a noun, "sempiternity" means: Existence within time but infinitely into the future, as opposed to eternity, understood as existence outside time.

How do you pronounce "sempiternity"?

The IPA (International Phonetic Alphabet) transcription for "sempiternity" is /ˌsɛmpɪˈtɜːnəti/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.

What is the origin of the word "sempiternity"?

From sempitern(al) + -ity, from Latin sempiternitas. See the full etymology section above for more details.

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.

Using “sempiternity”

The practical upshot for anyone who landed here from a spell-check.

The one correct English spelling is S-E-M-P-I-T-E-R-N-I-T-Y - every other letter order is a misspelling in standard orthography.
Say it as /ˌsɛmpɪˈtɜːnəti/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
Browse more English words and confusable pairs in the same reference. English words

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.