Noun

(en noun)

A male or sometimes female attendant who or similar.

* , title=The Mirror and the Lamp

, chapter=2 citation , passage=She was a fat, round little woman, richly apparelled in velvet and lace, […]; and the way she laughed, cackling like a hen, the way she talked to the waiters and the maid, […]—all these unexpected phenomena impelled one to hysterical mirth, and made one class her with such immortally ludicrous types as Ally Sloper, the Widow Twankey, or Miss Moucher.}}

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=5 citation , passage=A waiter brought his aperitif, which was a small scotch and soda, and as he sipped it gratefully he sighed.
  ‘Civilized,’ he said to Mr. Campion. ‘Humanizing.’ […] ‘Cigars and summer days and women in big hats with swansdown face-powder, that's what it reminds me of.’}}

(literally) Someone who waits for somebody or something; a person who is waiting.

(obsolete) A vessel or tray on which something is carried, as dishes, etc.; a salver.

Noun

(en noun)

A patron; one who purchases or receives a product or service from a business or merchant, or intends to do so.

Every person who passes by is a potential customer .

(informal) A person, especially one engaging in some sort of interaction with others.

a cool customer''''', ''a tough '''customer''''', ''an ugly '''customer