Question

Causing a great change (give meaning)?

Answer 1

change from one situation from state to another

Answer 2

Causing a great change means to change it by a great extent.

This refers to various things .

For example :

If you change your living , it will cause a great change in your habits.

Change in the climate causes a great change in the weather of a place.

Change in the period of time is the periodic change.

Change is not periodic when it is irregular with time.