1. In mechanics, a device for holding the parts of ball or roller bearings in place.
2. A fee paid, or the agreement made, to employ an attorney to serve in a suit; a retaining fee.
3. A similar fee paid to anyone to retain his services.
4. A fee paid to reserve the services of a professional; such as, an attorney or accountant, whenever one is needed.
5. A fixed or removable device worn in the mouth to hold the teeth in their new position during the adaptive period after straightening appliances have been removed following an orthodontic treatment.
6. In former times, a soldier or someone else who supported or was dependent on a person of high rank; also, a servant or attendant who has served a family for many years.