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To find the meaning of a word a dictionary would be used. If you are looking for synonyms and antonyms of a word, you would use a thesaurus. Etiquette is a noun that means the customary code of polite behavior in society or among members of a particular profession or group.
I would use the PDR
The forms required by good breeding, or prescribed by authority, to be observed in social or official life; observance of the proprieties of rank and occasion; conventional decorum; ceremonial code of polite society.
The forms required by good breeding, or prescribed by authority, to be observed in social or official life; observance of the proprieties of rank and occasion; conventional decorum; ceremonial code of polite society.
almanac
I would use internet or ipod/iphone
Roget's Thesaurus Roget's Thesaurus
A history textbook.
Wikipedia
encyclopedia
in a almanac!