1.
A machine or piece of equipment that is ~ is in use or is ready for use.
The whole system will be fully ~ by December 1995.
ADJ: usu v-link ADJ
2.
Operational factors or problems relate to the working of a system, device, or plan.
The nuclear industry was required to prove that every ~ and safety aspect had been fully researched.
ADJ: usu ADJ n
~ly
The device had been used ~ly some months previously.
ADV: ADV adj, ADV after v