Advantageous means putting you in a better position than before. An advantageous position, mutually advantageous, advantageous terms.
It is the formal word of contracts and negotiations, where mutually advantageous is the polite way of saying both sides gain. Note the shift in sound from advantage, which trips up spellers and speakers alike.
1adjectiveadvantageousPutting you in a better position than before.
“Speaking Spanish would be advantageous for this job.”
advantageous is a quality.
Middle French avantageus comes from avantage, from avant, before, from Latin ab ante.
Middle French
avantageus
English, today
advantageous
From advantage + ous or from Middle French avantageus (French avantageux). See advantage.
Etymology from Wiktionary, CC BY-SA