Also known as 'Going Live'. The point in time a company or organisation, etc., replaces an old program or system with a new one.

The event or action that takes place when the product, service, or project element contracted for by the client is placed in operation or turned over to the client (i.e. transferred to the •care, cust [..]

The physical changing of circuits or lines from one configuration to another.

Physical changing of lines from one system to another, usually at the time of a new system installation.

See switchover.

  Sometimes known as 'going live'. Cutover is the point at which a new program or system, takes over - perhaps from a previous version, and the old program is no longer used. On major developments, this point is reached when the new software has been written, tested, and run satisfactorily, in parallel with the old, for an agreed period. [..]

A cutover is the physical switchover from an old system to a new one. It is the point at which a new system becomes operational.