to retain (something) for future use

to arrange that (a seat, hotel room, etc) be kept for one's own or another's use at a specified future time

to hold (something) over until later

to retain (e.g. a right)

a supply of something retained for future use or need

= reservation (4)

restraint, closeness, or caution in one's words and actions; reticence

the act of making a qualification or expressing doubt

accepted without reserve

(also in pl) money, gold, foreign exchange, etc kept in hand or set apart, usu to meet liabilities