[pindab0ter]

I understand that defining advertising is hard, but "1 : a public notice" is so broad as to be almost meaningless as a definition.

[quectophoton]

I personally don't find it that vague, but that might be my non-English bias.

[pindab0ter]

It leaves a lot unsaid. Advertising has a lot of connotations and cultural significance. It can evoke strong feelings for one and be a livelihood for another. Simply stating that an advertisement is 'a public notice' doesn't do it justice.

I understand that dictionaries are not encyclopedias, but a little more is warranted IMO.