refer

It’s unclear where the word “Viking” came from, but in Old Norse it apparently referred to an act of maritime raiding.

There's first a cue, which is a trigger for behavior, and then the behavior itself, which we usually refer to as a routine.

It's just me adding- NASA was talking about the estimate, the cost of 62 to 63 trillion dollars per gram of antihydrogen, actually is what they're referring to.