semiannual

adj

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

"semiannual" is a 10-letter English headword indexed on PlainSpell.

The verdict

“semiannual” is uncommon English (frequency #84,731 among 6,566 “S” headwords), classed as an adjective. The kind of spelling people second-guess.

#84,731
frequency rank, English
6,566
“S” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Biannual: occurring twice a year

Corpus desk

Index EN-semiannual · semiannual · English

semiannual · rank #84,731 · 0 variants · 0 confusables

  • FREQ-RARE #84,731
  • LEN-MEGA 10 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH selloff

Nearest frequency peer: selloff (-1 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 “semiannual”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for semiannual
PropertyValue
Headwordsemiannual
LanguageEnglish
Part of speechAdjective
Letters10
Frequency rank#84,731
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “semiannual” in English

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).semiannualfalls 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: “selloff” (#84,730), “sepoy” (#84,734), “sectioning” (#84,727). Among 6,566 “S” headwords, “semiannual” is #84,731. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

semiannual is uncommon English at frequency #84,731 among 6,566 “S” headwords, classed as anadjective. Rarity is why readers land here mid-draft. Gloss: "Biannual: occurring twice a year".

The misspelling generator found no plausible variants for semiannual, typically a sign the spelling maps closely to how the word sounds. No confusable counterpart is on file for this word, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From semi- + annual. The correct English form is semiannual, spelled S-E-M-I-A-N-N-U-A-L.

Definition

  1. 1
    Biannual: occurring twice a year

Etymology

From semi- + annual.

Synonyms

biannual

This word in other languages

semi-annuel(Français)halbjährlich(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 "semiannual"?
"semiannual" is spelled S-E-M-I-A-N-N-U-A-L.
What does "semiannual" mean?
As an adjective, "semiannual" means: Biannual: occurring twice a year
What is the origin of the word "semiannual"?
From semi- + annual. 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 "semiannual", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 10 letters (nearest by frequency rank).

sectioning#84,727shampooing#84,739Santamaria#84,712Sandilands#84,711

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

Source: FrequencyWords open word-frequency list