backfill
Definition, pronunciation, etymology, and usage for the English word. Free spelling reference powered by Wiktionary.
Detailed reference entry for the English word "backfill", 8-letters, with pronunciation in International Phonetic Alphabet notation, etymology traced through Germanic and Romance roots where applicable, common misspelling variants catalogued from Wiktionary, and usage frequency ranked against an open word-frequency list covering the top 100,000 English words. PlainSpell covers English, Spanish, Portuguese, French, and German spelling with confusable-pair detection that highlights visually and phonetically similar words. This entry for "backfill" includes synonyms, antonyms, homophones, and cross-language translation pointers sourced from Wiktionary via the kaikki.org extract. Whether you are verifying the correct spelling of "backfill" for academic writing, checking homophone confusion, or exploring etymological origins, this page provides a citation-backed, free reference that requires no sign-up.
The verdict
“backfill” is an uncommon English word, ranked #77,436 in English word frequency and used as a verb.
- #77,436
- frequency rank, English
- 8
- letters
Dominant Wiktionary sense: To refill a hole with the material dug out of it.
Compare similar words
See how backfill compares against similar English words.
Browse all word comparisons →| Property | Value |
|---|---|
| Headword | backfill |
| Language | English |
| Part of speech | Verb |
| IPA | /ˈbækfɪl/ |
| Letters | 8 |
| Frequency rank | #77,436 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “backfill” sits in English frequency
Spelling & Dictionary Insight
The English entry for backfill is 8 letters long, classified as a verb, and transcribed in the International Phonetic Alphabet as /ˈbækfɪl/. Corpus data places it at rank #77,436 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 5 distinct senses for this headword, so context determines which meaning a reader should apply.
No misspelling variants are generated for backfill in our index, suggesting the orthography follows predictable English patterns. It is not paired with a close-neighbour confusable in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: From back + fill. Root origin matters for spelling because borrowed morphemes (Greek, Latin, Old French, Old English) carry their source-language orthographic conventions into modern English, which is why historical etymology is often the cleanest predictor of whether a cluster like "-ough", "-eau", or "-tion" will appear. For readers arriving here from a spelling check, the authoritative guidance is: the correct English form is backfill, spelled B-A-C-K-F-I-L-L, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.
Definition
- 1To refill a hole with the material dug out of it.
- 2To refill an excavation unit to restore the former ground surface and/or to preserve the unit and make it recognizable as having been excavated.
- 3To provide reserve support.
- 4To replenish or restock due to attrition or loss.
- 5To enter an online game that's already in progress, replacing a player who left early.
Etymology
From back + fill.
This word in other languages
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.
Cite this page
Free to reuse with attribution (CC BY-SA). Copy the citation:
PlainSpell, “backfill, English word data” (May 6, 2026). Derived from Wiktionary (kaikki.org, CC BY-SA) and an open word-frequency list. https://plainspell.com/en/word/backfill
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Using “backfill”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is B-A-C-K-F-I-L-L - every other letter order is a misspelling in standard orthography.
- Say it as /ˈbækfɪl/ (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
Nearby English words
Other entries that begin with the letter B in our English index: