having previously made an arrangement to do something
根据预先约定
visits are by appointment only.
未经预约，谢绝参观（或来访）。
(in the UK) used by manufacturers to indicate that their products are sold to the queen and are therefore of guaranteed quality
（英国） 女王陛下御用（制造商的产品宣传用语，宣称女王系其客户，以示其产品质量有保证）
power to select the holder of a particular job or position
（决定由何人担任某一任务或职务的）甄选权
(Law)power to decide the disposal of property, in exercise of a right conferred by the owner
(律)（由财产所有人授予的）财产处置权