There are 5 main definitions of re in English:

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.

Definition of re in:

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There are 5 main definitions of re in English:

re2

Line breaks: re

noun

Variant spelling of ray3.

Definition of re in:

There are 5 main definitions of re in English:

Re3

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

Definition of re in:

There are 5 main definitions of re in English:

Re4

Line breaks: Re

symbol

The chemical element rhenium.

Definition of re in:

There are 5 main definitions of re in English:

RE5

Line breaks: RE
Pronunciation: /ɑːrˈiː
 
/

abbreviation

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