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 17,902 “I” headwords), classed as an adverb. The kind of spelling people second-guess.

#78,716
frequency rank, English
17,902
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - In an infinitesimal manner.

Key facts for infinitesimally
PropertyValue
Headwordinfinitesimally
LanguageEnglish
Part of speechAdverb
Letters15
Frequency rank#78,716
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “infinitesimally” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). infinitesimally lands here:

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

infinitesimally is uncommon English at frequency #78,716 among 17,902 “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.

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.

Using “infinitesimally”

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

  • The one correct English spelling is I-N-F-I-N-I-T-E-S-I-M-A-L-L-Y - every other letter order is a misspelling in standard orthography.
  • Browse more English words and confusable pairs in the same reference. English words

Other uncommon English words near this rank

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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list