en-

en- ¹ or em- or in-

pref.

1.

a. To put into or onto: encapsulate.

b. To go into or onto: enplane.

2. To cover or provide with: enrobe.

3. To cause to be: endear.

4. Thoroughly. Used often as an intensive: entangle.

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[Middle English, from Old French, from Latin in-, in; see en in Indo-European roots.]

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en- ² or em-

pref.

In; into; within: enzootic.

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[Middle English, from Latin, from Greek; see en in Indo-European roots.]

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en-¹, em-

prefix forming verbs

1. (from nouns)

a.  put in or on entomb enthrone

b.  go on or into enplane

c.  surround or cover with enmesh

d.  furnish with empower

2. (from adjectives and nouns) cause to be in a certain condition enable encourage enrich enslave

[via Old French from Latin in- in-²]

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en-², em-

prefix forming nouns and adjectives

in; into; inside endemic

[from Greek (often via Latin); compare in-¹, in-²]