A standard or go-to item; a classic or regularly chosen option — a staple or fixture commonly relied upon.
この店の定番メニューは唐揚げ定食だ。
The restaurant's staple menu item is the fried-chicken set meal.
旅行の定番お土産として、その地域の名産がよく選ばれる。
Local specialties are often chosen as standard souvenirs for trips.
彼女はその色のスカートを何度も着ており、まさに定番だ。
She wears that color of skirt many times; it's truly her go-to item.
Originally: a basic item with stable demand; a staple good that consistently sells.
米は多くの家庭で長年にわたる定番の主食だ。
Rice has been a staple food for many households for years.
その店は定番商品が多く、安定した売り上げを保っている。
The store has many staple products and maintains steady sales.