What is the meaning of El-?

The form taken by en- before the consonant l like ellipse and elliptical)-->, as it assimilates place of articulation.

out, from

all the way, to a significant degree of completion, up

indicates actions whose direction is pointing away from the speaker, either literally or figuratively

indicates the unsuccessful or inaccurate completion of an action

indicates separation, deprivation, etc.

indicates completeness or perfection

indicates continuity over a long period of time

foreign, strange

different, other

to lean

Source: wiktionary.org