The permanent doubt.

After many years wondering the real meaning of these 2 abbreviations I found
the answer.

I let them here as usual like memory backup :o)

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Adverb
S: (adv) i.e., ie, id est (that is to say; in other words)

Adverb
S: (adv) for example, for instance, e.g. (as an example)

The abbreviation ``i.e.'' means ``that is,'' and the abbreviation ``e.g.''
means ``for example.