Real Dictionary

logo
countable noun: The logo of a company or organization is the special design or way of writing its name that it puts on all its products, notepaper, or advertisements.

LOGO in American English
a distinctive company symbol, colophon, signature, trademark, newspaper nameplate, etc.
a simplified computer language designed esp. for teaching school children about computer programming
noun: a graphic representation or symbol of a company name, trademark, abbreviation, etc., often uniquely designed for ready recognition
noun: a high-level programming language formerly used to teach children how to use computers

logo in British English
noun

logo- in American English
word, speech, discourse
combining form: a combining form appearing in loanwords from Greek, where it meant “word,” “speech” (logography); on this model, used in the formation of new compound words (logotype)

logo- in British English
combining form: indicating word or speech