add-on

Noun

attributive sometimes

(sometimes attributive) Something which can be appended to something else.

Japanese Meaning

追加部品（追加として取り付けられる部品） / 付加機能（本体に後から加えられる機能） / 拡張機能（オプションとして追加される機能や要素）

I installed the add-on to extend the browser's capabilities.

ブラウザの機能を拡張するために拡張機能をインストールしました。

Sense（1）

(sometimes attributive) Something which can be appended to something else.

Payments made before an add-on sale must be allocated entirely to the previous contract or contracts.

Sense（2）

Microdrives that can hold several gigabytes (see Figure 2.20) have been available as add-ons for portable devices.

Sense（3）

(poker) Additional chips that can be purchased at specific times in tournament play.

add-ons

（ plural ）