by appointment Definition

appointment
noun

1. An arrangement to meet someone.

Thesaurus: engagement, arrangement, meeting, rendezvous, invitation, conference, tête-à-tête, date.
2a. The act of giving someone a job or position;

Thesaurus: selection, designation, election, nomination, assignment, installation, delegation, empowering, promotion, approval, choice.
2b. The job or position someone is given;
2c. The person who is given a job or position.
3. formal
Equipment and furnishings.
Thesaurus: furnishings, fittings, gear, paraphernalia, accoutrements, trappings, fixtures, outfit.
Form: appointments

Idiom: by appointment

At a time arranged in advance.
Example: saw his clients only by appointment

Idiom: by appointment to someone

A designation appended to the name of a supplier of goods or services, etc to show that it has been chosen and approved by someone, especially by some royal figure.
Example: was delighted to have ‘by appointment to HRH Princess Margaret' after the firm's name