The proclitic il- is the definite article, equivalent to "the" in English.

Written works copied from the equivalent article at the French Wikipedia.

This page is based on an equivalent article at the German Wikipedia.

Parts of the biography are based on an equivalent article at the French Wikipedia.

This article is a translation of the equivalent Danish article.

However there seems to be no equivalent article in the journal of the Irish Law Society.

Written works copied from an equivalent article at the German Wikipedia.

List of written works copied from an equivalent article at the German Wikipedia.

Biographical information based on an equivalent article at the German Wikipedia.

This phrase is found in the equivalent article in the general directive.