secondmentnoun [ C or U ]
uk/səˈkɒndmənt/usHR, WORKPLACEa period of time when an employee is sent to work somewhere else temporarily, either to increase the number of workers there, to replace a worker, or to exchange experiences and skills:
secondment to/from sth My last post in the probation service was a secondment to Bristol Prison.
on secondment Next month Douglas, who has been on secondment from BT, goes back to his old job.
sb's secondment as sth This was during her secondment as an economic adviser to the Treasury.