The phrase "invincibles season" refers to a season in sports, particularly football (soccer), where a team remains undefeated throughout the entire competition. Full definition
Simple really, because in my opinion the two biggest reasons for Arsenal not having won it since the amazing invincibles season of 2004 is our ever present injury crisis and the pressure of expectation and what it does to us. (justarsenal.com)
Next season we need new players and a change of tactics but above all a consistency we have never had since the invincibles (justarsenal.com)
Chief executive Ivan Gazidis heaped praise on Wenger for his incredible 22 - year service which delivered three titles, seven FA Cups and that amazing Invincibles season in 2003/2004. (thesun.ie)