Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: by cause (that)

because

1 conjunction
     
be‧cause1 S1 W1
1 used when you are giving the reason for something:
We didn't enjoy the day because the weather was so awful.
'Why can't I go?' 'Because you're not old enough.'
Hubert never experienced any fear, and this was partly because he was not particularly intelligent.
Many exam candidates lose marks simply because they do not read the questions properly.
I decided to go with them, mainly because I had nothing better to do.
2

just because ...

spoken used to say that although one thing is true, it does not mean that something else is true:
Just because you're my brother doesn't mean I have to like you!
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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