infinitesimally

adv

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

"infinitesimally" is a 15-letter English headword indexed on PlainSpell.

The verdict

“infinitesimally” is uncommon English (frequency #78,716 among 2,140 “I” headwords), classed as an adverb. The kind of spelling people second-guess.

#78,716
frequency rank, English
2,140
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - In an infinitesimal manner.

Corpus desk

Index EN-infinitesimally · infinitesimally · English

infinitesimally · rank #78,716 · 0 variants · 0 confusables

  • FREQ-RARE #78,716
  • LEN-MEGA 15 letters
  • VOW-7 7 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH interjection

Nearest frequency peer: interjection (+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 “infinitesimally”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for infinitesimally
PropertyValue
Headwordinfinitesimally
LanguageEnglish
Part of speechAdverb
Letters15
Frequency rank#78,716
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “infinitesimally” in English

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).infinitesimallyfalls in this rarity band:

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “interjection” (#78,718), “Inverclyde” (#78,720), “indefinable” (#78,711). Among 2,140 “I” headwords, “infinitesimally” is #78,716. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

infinitesimally is uncommon English at frequency #78,716 among 2,140 “I” headwords, classed as anadverb. Rarity is why readers land here mid-draft. 2 senses are on record.

No misspelling variants are generated for infinitesimally in our index, since its letter pattern doesn't lend itself to common typo substitutions. This headword has no recorded confusable partner, a sign it's visually distinctive enough not to be mixed up with another word.

Etymologically, the entry records: From infinitesimal + -ly. The correct English form is infinitesimally, spelled I-N-F-I-N-I-T-E-S-I-M-A-L-L-Y.

Definition

  1. 1
    In an infinitesimal manner.
  2. 2
    To an infinitesimal degree.

Recorded use

Wiktionary example

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

  1. His idea is to stand billions of ultrafine wire loops around the edge of a silicon chip — hence the name racetrack — and use electric current to slide infinitesimally small magnets up and down along each of the wires to be read and written as digital ones and zeros.

Etymology

From infinitesimal + -ly.

This word in other languages

infinitésimalement(Français)

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 "infinitesimally"?
"infinitesimally" is spelled I-N-F-I-N-I-T-E-S-I-M-A-L-L-Y.
What does "infinitesimally" mean?
As an adverb, "infinitesimally" means: In an infinitesimal manner.
What is the origin of the word "infinitesimally"?
From infinitesimal + -ly. 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 "infinitesimally", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 15 letters (nearest by frequency rank).

counterbalanced#79,418perpendicularly#78,008anticoagulation#77,414Americanization#77,400

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

Source: FrequencyWords open word-frequency list