Assumption
Expectation
noun, verbal noun
When you imagine something that's somewhat determined, that means you already have some sort of assumption or expectation about it.
想定 usually refers to assumptions made in advance about certain conditions or situations. It’s often used when talking about preparing for or anticipating future events, especially ones where planning might be required, like natural disasters.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
心配いりません。それは想定内です。
Don't worry. That is to be expected.
想定外のことが起きても、落ち着いて行動できるようトレーニングを重ねています。
Even if unexpected things happen, I am training myself to remain calm and act accordingly.
地震を想定した避難訓練を行います。
We will now conduct the disaster drill assuming there is an earthquake.