1. protocol
A protocol is a system of rules about the correct way to act in formal situations.
e.g. He has become something of a stickler for the finer observances of royal protocol.
2. simultaneous
At the same time instantly
e.g. Well, a chord is just a simultaneous sounding of two or more pitches.
3. perceive
If you perceive something, you see, notice, or realize it, especially when it is not obvious.
e.g. A key task is to get pupils to perceive for themselves the relationship between success and effort.
