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Having no fixed, sure pattern - based on chance, so you cannot say for certain what will happen next, only how likely each result is. This is a formal word from math, science, and , not something people say in daily talk.
隨機的（統計、數學用語）
組成Probably from an old Greek word meaning 'to aim at a target' or 'to guess' - fitting, since something stochastic is like aiming at an outcome you can't be sure to hit.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
stochasticadj/stəˈkæstɪk/
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random, randomly determined.
- In the evening, while she bathed, waiting for him to enter the bathroom as she powdered her body, he crouched over the blueprints spread between the sofas in the lounge, calculating a stochastic analysis of the Pentagon car park.
- Self-slaughter, as Hamlet always says, was certainly in the cards, unless one had been out here long enough to have contemplated the will of God, observed the stochastic whimsy of the day, learned when and when not to whisper “Insh'allah,” and understood how, as one perhaps might never have in England, to await, to depend upon, the ineluctable departure of what was most dear.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。