noun
Japanese idol; pop idol; idol singer
Refers specifically to a performer in a manufactured pop group (boy band or girl group) whose public image is carefully cultivated to attract a dedicated fan base. This is the most common modern meaning in Japanese.
彼女は人気アイドルグループのメンバーだ。
She is a member of a popular idol group.
アイドルを目指してレッスンに通っている。
I'm taking lessons aiming to become an idol.
noun
icon; star; celebrity; admired figure
A broader, figurative use for any person who is greatly admired, like a cultural icon or a star in any field. Not limited to the pop music industry.
彼は若者のアイドルとして知られている。
He is known as an idol for young people.
あの作家は多くの読者にとってアイドル的な存在だ。
That author is an idol-like figure for many readers.
noun
idol (religious); graven image
Refers to a physical object of worship, such as a statue or image. This is a more literal, often religious or historical usage, and is less common in everyday conversation. The synonym 偶像 is more frequently used for this meaning.
See also: 偶像
古代の人々は木や石で作ったアイドルを崇拝した。
Ancient people worshiped idols made of wood or stone.