There are 2 definitions of en in English:

en1

Line breaks: en

noun

Printing
A unit of measurement equal to half an em and approximately the average width of typeset characters, used especially for estimating the total amount of space a text will require.

Origin

late 18th century: the letter N represented as a word, since it is approximately this width.

Definition of en in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…

There are 2 definitions of en in English:

en-2

Pronunciation: /ɪn, ɛn/
(also em-)

prefix

Within; inside: empathy energy enthusiasm

Origin

from Greek.

Definition of en in: