We created a system to manage customer information in one centralized place.
This theory tries to explain society by a single principle.
one era; single era name
Rare historical use, most familiar in the phrase 一世一元, referring to using one era name for one reign or sovereign.
From the Meiji period onward, Japan adopted the system of one era name per reign.
one unknown; one variable
Mathematical term used in compounds such as 一元方程式 and 一元一次方程式, meaning that an equation has one unknown quantity.
We solved linear equations in one unknown in class.
description from one perspective