There are 2 definitions of en in English:

en1

Syllabification: 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 dissonant
Pronunciation: ˈdɪs(ə)nənt
adjective
lacking harmony

There are 2 definitions of en in English:

en-2

Syllabification: en-
(also em-)

prefix

Within; inside: encyst endemic embolism empyema

Origin

from Greek.

Definition of en in: