fiducial
/f(a)ɪˈdjuːʃ(ɪ)əl/adjective, noun
fiducial is an adjective meaning “Accepted as a fixed basis of reference” (English Wiktionary, September 2026). It is spelled F-I-D-U-C-I-A-L, and it appears about once in every 21 million words in written English (wordfreq, 2021 data).
What does fiducial mean?
adjective
- 1
Accepted as a fixed basis of reference.
Rulers and coins make good fiducial markers in photographs.
- 2
Based on having trust.
noun
- 1
In photography, a familiar reference object used to show size or scale, such as a ruler or a coin; a fiducial marker.
- 2
In manufacturing, a small mark on a circuit board used to align components; a fiducial point.
- 3
A pattern used in a QR code or similar to aid the electronic reader with determining its alignment.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you pronounce fiducial?
- UK /f(a)ɪˈdjuːʃ(ɪ)əl/
- UK /-ˈdʒuː-/
- UK /-uːs(ɪ)əl/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of fiducial
- more fiducial comparative
- most fiducial superlative
- fiducials plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is fiducial?
Fiducial appears about once in every 21 million words in written English, the 138,319th 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).
Fiducial in Spanish, French, German and Portuguese
In the sense accepted as a fixed basis of reference:
| Language | Words |
|---|---|
| French | fiduciaire |
| German | fiduziell |
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 fiducial come from?
From Late Latin fīdūciālis, from fīdūcia (“trust, reliance”) + -ālis, from fīdō (“to trust”).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).