Which of these terms was specifically coined as part of a product marketing campaign and later entered the mainstream English vocabulary?

Throughout history, certain brands have contributed memorable phrases and neologisms to our everyday language. Some advertising slogans were so effective they transcended marketing to become cultural touchstones, while others created entirely new words that are now part of standard lexicons worldwide. This trivia question tests your knowledge about the intersection of advertising language and linguistic evolution - can you identify which famous linguistic innovation actually originated as a product marketing campaign?

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Halitosis (referring to bad breath)
Procrastination (delaying or postponing tasks)
Fortnight (a period of two weeks)
Serendipity (making fortunate discoveries by accident)