principally.

Mainly, or with one consideration occupying the chief role.

Use it for

Words that belong together

• principally concerned
• principally responsible

On the page

The review was principally concerned with implementation rather than policy aims.

The outcome depended principally on access to support, though other factors also mattered.

Usage notes

Primary category: academic / formal. Forms: Invariable adverb; no plural or tense forms. Comparison is used only where a particular degree naturally permits it. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: inference, qualification, analysis, methodology. Disciplines: academic writing, reasoning, research. Commonness: moderately common.