This one's easy. An advert is an advertisement: just shorten advertisement, and you get advert. As a verb, to advert to something means to refer to it.

The noun advert (AD-vert) shows up mostly in England, where people use it interchangeably with advertisement, as in "Did you see that advert in the paper? If you buy two pairs of socks, you get a third pair free!" The verb advert (ad-VERT), on the other hand, means to "make reference to," like the way your mom might advert to your messy room and unfinished chores when you complain that you're bored.

Primary Meanings of advert

a public promotion of some product or service
give heed (to)
Full Definitions of advert

n a public promotion of some product or service

ad, advertisement, advertising, advertizement, advertizing
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direct mail
advertising sent directly to prospective customers via the mail
preview, prevue, trailer
an advertisement consisting of short scenes from a motion picture that will appear in the near future
an advertisement that is written and presented in the style of an editorial or journalistic report
an advertisement that is sent by mail
newspaper ad, newspaper advertisement
a printed advertisement that is published in a newspaper
commercial, commercial message
a commercially sponsored ad on radio or television
bill, broadsheet, broadside, circular, flier, flyer, handbill, throwaway
an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
an advertisement that offers something free in order to arouse customers' interest
top billing
the advertisement of a star's name at the top of a theatrical poster
classified, classified ad, classified advertisement
a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type
infomercial, informercial
a television commercial presented in the form of a short documentary
an advertising circular that is enclosed with other material and (usually) sent by mail
Type of:
packaging, promotion, promotional material, publicity
a message issued in behalf of some product or cause or idea or person or institution

v give heed (to)

attend, give ear, hang, pay heed
pay attention to exclusively and obsessively
Type of:
hear with intention

v make reference to

bring up, cite, mention, name, refer
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commend, remember
mention as by way of greeting or to indicate friendship
speak of the devil
mention someone's name who just then appears
mention favorably, as in prayer
cite, quote
refer to for illustration or proof
touch on
refer to or discuss briefly
appeal, invoke
cite as an authority; resort to
refer to people that one assumes one's interlocutors admire in order to try to impress them
bring up, raise
put forward for consideration or discussion
drag up, dredge up
mention something unpleasant from the past
refer from one entry to another, as in catalogues, books, and lists
Type of:
have in mind, mean, think of
intend to refer to

v make a more or less disguised reference to

allude, touch
bear on, come to, concern, have-to doe with, pertain, refer, relate, touch, touch on
be relevant to
Type of:
hint, suggest
drop a hint; intimate by a hint

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