the reason why something, especially something bad, happens, example of the sentences :

The police are still trying to establish the cause of the fire.

She had died of natural causes.

I wouldn't tell you without (good) cause (= if there was not a (good) reason).

I believe we have/there is just cause (= a fair reason) for taking this action

we pronounce 'cause' like :

\ ˈkȯz  \

Definition of cause

 (Entry 1 of 2)

1a: a reason for an action or condition : MOTIVE

b: something that brings about an effect or a resulttrying to find the cause of the accident

c: a person or thing that is the occasion of an action or statea cause for celebrationespecially : an agent that brings something aboutShe is the cause of your troubles.

d: sufficient reasondischarged for cause

2a: a ground of legal action

b: CASEThey are paid by the cause for their expert opinions.

3: a matter or question to be decidedThe city council is involved with school department causes.

4a: a principle or movement militantly defended or supportedthe insurgents' cause

b: a charitable undertakingfor a good cause

cause

 verb

caused; causing

Definition of cause (Entry 2 of 2)

transitive verb

1: to serve as a cause or occasion ofcause an accident

2: to compel by command, authority, or forcecaused him to resign

that's all i know

hope it may helps u a lot :)