adj · name · noun · 5 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ˌd͡ʒɛfəˈsəʊ.ni.ən/
General-American:/ˌd͡ʒɛfɚˈsoʊ.ni.ən/
rhymes with -əʊniən
CMU ARPABET:JH EH2 F ER0 S OW1 N IY0 AH0 N
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adj
Meaning 1
Of or relating to Thomas Jefferson, or to his political theories.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
name
Meaning 2
A sub-age from 475 to 473 million years ago, a subdivision of the Ordovician.
Definition source: English Wiktionary via Wiktextract
Topics: geography, geology, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
A follower of Thomas Jefferson, or an advocate of his political theories.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
adjective
Meaning 4
relating to or characteristic of Thomas Jefferson or his principles or theories
Definition source: Princeton WordNet 3.0
Examples
Jeffersonian democracy
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
noun
Meaning 5
a follower of Thomas Jefferson or his ideas and principles
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: follower
History
Etymology
Etymology tree English Jefferson Proto-Indo-European *-nós Proto-Italic *-nos Latin -nus Latin -ānus Latin -iānusbor. English -ian English Jeffersonian From Jefferson + -ian.