There are 5 main definitions of re in English:

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re1

Line breaks: re
Pronunciation: /riː
 
, reɪ
 
/

preposition

1In the matter of (used typically as the first word in the heading of an official document or to introduce a reference in a formal letter): re: invoice 87
1.1About; concerning: I saw the deputy head re the incident

Origin

Latin, ablative of res 'thing'.

Usage

The traditional view is that re should be used in headings and references, as in Re: Ainsworth versus Chambers, but not as a normal word meaning ‘about’, as in I saw the deputy head re the incident. However, the evidence suggests that re is now widely used in the second context in official and semi-official contexts, and is now generally accepted. It is hard to see any compelling logical argument against using it as an ordinary English word in this way.

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There are 5 main definitions of re in English:

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re2

Line breaks: re

noun

Variant spelling of ray3.

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There are 5 main definitions of re in English:

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Re3

Line breaks: Re
Pronunciation: /reɪ
 
/
Variant spelling of Ra1.

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There are 5 main definitions of re in English:

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Re4

Line breaks: Re

symbol

The chemical element rhenium.

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There are 5 main definitions of re in English:

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RE5

Line breaks: RE
Pronunciation: /ɑːrˈiː
 
/

abbreviation

1Religious education (as a school subject).
1.1(In the UK) Royal Engineers.

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