Formerly vs Previously

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

Formerly

FormalBeyond 10,000 (less common)B2adverb

Previously

Top 2,000 (common)B1adverb
Most formal: FormerlyMost common: Previously
 FormerlyPreviously
Pronunciation🇬🇧 /["/ˈfɔːməli/"]/🇺🇸 /["/ˈfɔːrmərli/"]/🇬🇧 /["/ˈpriːviəsli/"]/🇺🇸 /["/ˈpriːviəsli/"]/
Meaningin the past; before nowBefore now; earlier.
ExampleNamibia, formerly known as South West AfricaThe building had previously been used as a hotel.
RegisterFormalNeutral
How commonBeyond 10,000 (less common)Top 2,000 (common)
CEFR levelB2B1
Part of speechadverbadverb
Collocationsformerly a leader, formerly known, formerly usedpreviously mentioned, previously discussed, previously stated, previously introduced, previously reported
Antonymscurrently, nowsubsequently, afterwards
Common mistakesConfused with 'formally' — 'formerly' relates to the past, while 'formally' relates to official contexts., Omitting it when describing past roles or states, which can lead to ambiguity.Using 'previous' instead of 'previously' in a sentence., Confusing 'previously' with 'currently' which means now., Misplacing 'previously' in a sentence and changing the meaning.
Usage notesUse 'formerly' to describe something that was true in the past but is no longer the case. It is more formal than saying 'used to'. Avoid in casual conversations.Use 'previously' to connect past events with the present. It's suitable for both spoken and written contexts but may sound too formal in casual conversations.

Frequently asked questions: Formerly vs Previously

What's the difference between Formerly and Previously?

Formerly: in the past; before now Previously: Before now; earlier.

Which is more formal: Formerly and Previously?

Formerly is the most formal of these.

Which is more common: Formerly and Previously?

Previously is the most common in everyday English.

Which is more advanced: Formerly and Previously?

Formerly is the highest level, at B2, on the CEFR scale.

Are Formerly and Previously the same CEFR level?

Formerly: B2, Previously: B1 on the CEFR scale.

What part of speech are Formerly and Previously?

Formerly: adverb, Previously: adverb.

Can you show an example of each?

Formerly: Namibia, formerly known as South West Africa Previously: The building had previously been used as a hotel.

Can I use Formerly and Previously interchangeably?

Not always. Formerly and Previously 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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