First of all vs Primarily

When to use each in English, with meaning, register, and examples.

First of all

Top 2,000 (common)

Primarily

Top 2,000 (common)B2adverb
 First of allPrimarily
Pronunciation🇬🇧 //fɜːst əv ɔːl//🇺🇸 //fɜrst əv ɔl//🇬🇧 /["/praɪˈmerəli//ˈpraɪmərəli/"]/🇺🇸 /["/praɪˈmerəli/"]/
MeaningTo start with; the first point to mention.mainly; for the most part
ExampleFirst of all, we need to discuss the budget for next year.a course designed primarily for specialists
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR level-B2
Part of speechadverb
Collocationsfirst of all, we need, first of all, let's discuss, first of all, thank you, first of all, I want to, first of all, rememberprimarily concerned, primarily focused, primarily used, primarily for, primarily about
Antonyms-secondarily, incidentally, subordinately
Common mistakesUsing it in the middle of a sentence instead of at the beginning., Confusing with 'firstly', which is more formal., Omitting 'of all' and saying only 'first'.Confused with 'principally' which has a similar meaning but different usage., Using it in a negative context incorrectly, such as saying 'not primarily' when 'not mainly' is clearer., Incorrectly placing 'primarily' at the end of a sentence.
Usage notesOften used to introduce the first point in a list. Appropriate in both spoken and written contexts. Avoid in very formal settings.Use 'primarily' when you want to focus on the main reason or purpose; it's suitable in both spoken and written English but is more common in formal contexts than casual conversation.

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First of all

Frequently asked questions: First of all vs Primarily

What's the difference between First of all and Primarily?

First of all: To start with; the first point to mention. Primarily: mainly; for the most part

Can you show an example of each?

First of all: First of all, we need to discuss the budget for next year. Primarily: a course designed primarily for specialists

Can I use First of all and Primarily interchangeably?

Not always. First of all and Primarily are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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