Experience is confused with occurrence. It’s also often confused with wisdom. Experience is the “understanding-level” derivative of occurrence the same way that wisdom is the “understanding-level” derivative of data:
Too often experience is code for “time served,” as in the common person specification: “Must have x years’ experience.” This is a lazy way of saying: “We want this person to have some idea of what they’re doing from day one.” It’s also wrong-headed: while it’s true that it’s easy enough to assess whether or not somebody’s done that amount of time doing something it isn’t necessarily true that they’ve done it the same way or with the same tools. This lack of applicable context bites even deeper when you think about what those years of “experience” might really be. Some people have 20 years’ worth of repetition of the same working week.
If you ever see "experience" in a person specification don’t be put off if you want the job: think about what might be required that would need “x years’ experience” to do. You might already have done it!