regular user; devoted user; person who favors something
Refers to someone who habitually uses or prefers a particular product, brand, or service. Often used in marketing or product reviews.
He is a regular user of this manufacturer's products.
We will hold a sale to thank our long-time loyal customers.
Compound of 愛用 (あいよう, 'habitual use') + 者 (しゃ, 'person').