1. In a synchronous system, the achieving of synchronization. 2. In a satellite communications system, the locking of tracking equipment on a signal from a communications satellite. 3. In a servomechanism, the entering of the boundary conditions that will allow the loop to capture the signal and achieve lock-on. 4. In logistics, to acquire, procure, obtain, or fetch hardware or software. 5. The action of acquiring, obtaining, fetching, or procuring an entity, item, or object. 6. In radar, the locking of tracking equipment on an active signal or on an echo from a target. See data acquisition,  knowledge acquisition,  system acquisition. See also condition,  echo,  entity,  fetch,  item,  object,  phase-locked loop,  procurement,  radar,  satellite communications system,  servomechanism,  signal,  synchronization,  synchronous,  synchronous optical network.