Definition of il- in English:

il-

Syllabification: il-

prefix

1 variant spelling of in-1, in-2.
2Assimilated before l (as in illustrate, illogical).

Definition of il- in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected