What does "definitive spawn % chance" mean?

[Hydroponic]

Originally Posted by Rogean [You must be logged in to view images. Log in or Register.]

[*]Nilbog: Rewrote Pyzjn script in Qeynos Hills. She now only spawns at night and has definitive spawn % chances.[*]Nilbog: Rewrote South Ro Ancient Cyclops script. He now only spawns at night with definitive spawn % chances.

Can anyone explain what definitive spawn % chance is? Does this mean there are no placeholders and the mobs just have a certain % chance to spawn each night? I have not found this wording anywhere else on the site so I am a bit confused.