effective
/ɪˈfɛktɪv/adjective, noun
effective is spelled E-F-F-E-C-T-I-V-E: 9 letters and 3 syllables. It appears 78 times per million words in written English, the 1,369th most frequent word form (wordfreq, 2021 data). As an adjective, effective means “Having the power to produce a required effect or effects” (English Wiktionary, September 2026).
How many letters and syllables are in effective?
| Letters | 9: E-F-F-E-C-T-I-V-E |
|---|---|
| Syllables | 3 (from its American pronunciation) |
| In writing | 78 times per million words; the 1,369th most frequent word form |
| Wrong spellings searched | none measured in search |
| Pairs people search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026).
How common is effective?
Effective appears 78 times per million words in written English, the 1,369th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce effective?
- /ɪˈfɛktɪv/
- /əˈfɛktɪv/
- Australia /əˈfektɪv/
Effective has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-effective.ogg, Wikimedia Commons (author and licence on each file's page).
Words people confuse with effective
Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).
Also written: triple-E.
Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).
Forms of effective
- more effective comparative
- most effective superlative
- eff.
- effectives plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does effective mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Having the power to produce a required effect or effects.
The pill is an effective method of birth control.
- 2
Producing a decided or decisive effect.
The president delivered an effective speech!
- 3
Efficient, serviceable, or operative, available for useful work.
How long does it take to make a bunch of civilians an effective military force?
- 4
Actually in effect.
effective immediately
- 5
Having no negative coefficients.
- 6
Such that no group element acts trivially.
- 7
approximate; Not describing the fundamental dynamic changes in some system as they happen.
noun
- 1
a soldier fit for duty
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you abbreviate effective?
Wiktionary records one abbreviation of effective: eff..
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Effective in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | efficace , décisif , en vigueur |
| German | wirksam, effektiv, wirkungsvoll |
| Portuguese | eficaz, efetivo |
| Spanish | efectivo, eficaz, presentáneo |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does effective come from?
From French effectif, from Latin effectīvus (“productive; effective”), from efficiō (“to make; to bring about”), equivalent to effect + -ive.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).