Wiktionary
n. 1 (context informal English) The most important of a group. 2 (context informal English) (l en oneself Oneself), especially one’s own (l en interests).
Usage examples of "numero uno".
Ho chiesto Bonnie, ho chiesto uno spettacolo che fosse il numero uno: e li ho avuti, tesoro, ma non sono mai stato così.
Forse, se Betsey fosse stata libera, sarei andato fuori con lei, ma era impegnata al numero uno di Police Plaza, a lottare contro la macchina burocratica.
But where tomorrow's sabotage is concerned, I'm the big honcho, what the media would call terrorist numero uno, and I am being compensated accordingly.
Somewhat to his surprise, she accepted, ate sparingly, drank nothing, listened to his confided ambition to be numero uno someday, and kissed him chastely on the cheek as he deposited her on her doorstep.
Like the food and the three Confedollar cigars and the imported booze, she was proof that Bart Fraden was the best, Numero Uno, the king of the mountain, the center of his universe.