Too many companies are now abusing this word, typically these are companies offering internet services. An example would be of Company A offering mobile/home broadband with unlimited usage. Then in the terms & conditions there will be a clause that restricts the customer to download only 1Gb of data per month.
This is NOT unlimited.
Unlimited is defined as being: not limited, infinite or unrestricted.
If no current law prevents this, then one should be made to cover this grey area.
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We the undersigned petition the Prime Minister to Ban the use of the word 'Unlimited' if the subject in question is limited.
http://petitions.number10.gov.uk/notlimited/