A unit is a single (= one) thing, group, etc., that has a particular purpose and is part of something larger.A unit is also a single item of a product.
unit とは、特定の目的を有する、何か大きいものの一部であるもの、つまり、1個、一式などのことです。unit は、製品の単品、という意味もあります。
I live in one of those small apartment buildings with just four units.
(call to maintenance)There’s something wrong with the heating unit in our office. It’s like a refrigerator in here.
The regular unit price is $45. But if you order 200 < units > or more, I can sell them to you for $40 per unit.