on

/ɒn/ preposition

1. being a member of a group

● to sit on a committee

● She is on the boards of two companies.

● We have 250 people on the payroll.

● She is on our full-time staff.

2. in a certain way

● on a commercial basis

● to buy something on approval

● to buy a car on hire-purchase

● to get a mortgage on easy terms

● He is still on probation.

● She is employed on very generous terms.

♦ on the understanding that on condition that, provided that

● We accept the terms of the contract, on the understanding that it has to be ratified by our main board.

3. at a time

● The shop is closed on Wednesday afternoons.

● We work 7 hours a day on weekdays.

● The whole staff has the day off on May 24th.

4. doing something

● The director is on holiday.

● She is in the States on business.

● The switchboard operator is on duty from 6 to 9.