adv · 2 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
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CMU ARPABET:P R IH1 N S IH0 P L IY0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adv
Meaning 1
In a primary manner; pertaining to the principal of a matter.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
adverb
Meaning 2
for the most part
Definition source: Princeton WordNet 3.0
Examples
he is mainly interested in butterflies
Meaning relationships
Synonyms: chiefly, primarily, mainly, in the main
Antonyms: none provided
History
Etymology
From Middle English principaly. By surface analysis, principal + -ly.
Across languages
Translations
1 source translations are retained for this English entry.