senility

/səˈnɪlɪti/

//səˈnɪlɪti// noun

By · According to Wiktionary data (CC BY-SA) ·

"senility" is a 8-letter English headword indexed on PlainSpell.

The verdict

“senility” is uncommon English (frequency #73,619 among 6,566 “S” headwords), classed as a noun. The kind of spelling people second-guess.

#73,619
frequency rank, English
6,566
“S” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The bodily and mental deterioration associated with old age: Synonym of senescence.

Corpus desk

Index EN-senility · senility · English

senility · rank #73,619 · 0 variants · 0 confusables

  • FREQ-RARE #73,619
  • LEN-LONG 8 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH Sebelius

Nearest frequency peer: Sebelius (-2 rank slots)

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.

Long-tail ranks near “senility”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “senility” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for senility
PropertyValue
Headwordsenility
LanguageEnglish
Part of speechNoun
IPA/səˈnɪlɪti/
Letters8
Frequency rank#73,619
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “senility” in English

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).senilityfalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Rare peers in the same band: “Sebelius” (#73,617), “sephiroth” (#73,621), “Schweizer” (#73,616). Among 6,566 “S” headwords, “senility” is #73,619. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

senility is uncommon English at frequency #73,619 among 6,566 “S” headwords, classed as anoun, transcribed /səˈnɪlɪti/. Rarity is why readers land here mid-draft. 3 senses are on record.

senility doesn't appear in our generated misspelling index, suggesting the orthography follows predictable English patterns. 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 senile + -ity. The correct English form is senility, spelled S-E-N-I-L-I-T-Y.

Definition

  1. 1
    The bodily and mental deterioration associated with old age: Synonym of senescence.
  2. 2
    The losing of memory and reason due to senescence.
  3. 3
    An elderly, senile person.

Recorded use

Wiktionary examples

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

  1. Near-synonym: second childhood
  2. He was entering his years of senility and not liking it a bit.

Etymology

From senile + -ity.

This word in other languages

senilidad(Español)sénilité(Français)Senilität(Deutsch)

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "senility"?
"senility" is spelled S-E-N-I-L-I-T-Y. The IPA pronunciation is /səˈnɪlɪti/.
What does "senility" mean?
As a noun, "senility" means: The bodily and mental deterioration associated with old age: Synonym of senescence.
How do you pronounce "senility"?
The IPA (International Phonetic Alphabet) transcription for "senility" is /səˈnɪlɪti/. 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 "senility"?
From senile + -ity. 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "senility", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 8 letters (nearest by frequency rank).

Sebelius#73,617Shizuoka#73,633shoegaze#73,634snowdrop#73,641

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

Source: FrequencyWords open word-frequency list