exfiltration

noun

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

"exfiltration" is a 12-letter English headword indexed on PlainSpell.

The verdict

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

Unranked
below top-frequency English
12
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The process of exiting an area (usually behind enemy lines or in enemy territory).

Key facts for exfiltration
PropertyValue
Headwordexfiltration
LanguageEnglish
Part of speechNoun
Letters12
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “exfiltration” sits in English frequency

exfiltration 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.

Rare enough to double-check

exfiltration is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. 5 senses are on record.

No misspelling variants are generated for exfiltration in our index, a straightforward case of a spelling with little room for common typos. This headword has no recorded confusable partner, since its spelling is unusual enough that it doesn't cluster with a lookalike.

No explicit etymology string is stored for this entry, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct English form is exfiltration, spelled E-X-F-I-L-T-R-A-T-I-O-N.

Definition

  1. 1
    The process of exiting an area (usually behind enemy lines or in enemy territory).
  2. 2
    A method for managing storm water runoff.
  3. 3
    A filtering out (usually movement of a substance through a barrier).
  4. 4
    A gradual movement of a substance to exterior (as through cell membrane to extracellular fluid or medium).
  5. 5
    The covert extraction of data from a system.

Synonyms

exfil

Antonyms

infiltration

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 "exfiltration"?
"exfiltration" is spelled E-X-F-I-L-T-R-A-T-I-O-N.
What does "exfiltration" mean?
As a noun, "exfiltration" means: The process of exiting an area (usually behind enemy lines or in enemy territory).
What language does "exfiltration" come from?
"exfiltration" 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.

Using “exfiltration”

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

  • The one correct English spelling is E-X-F-I-L-T-R-A-T-I-O-N - every other letter order is a misspelling in standard orthography.
  • 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.

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

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