relating to or happening in one particular country and not involving any other countries

国内的，本国的:

the booming domestic economy

迅速增长的国内经济

US foreign and domestic policy

美国的对外及对内政策

our nation's domestic affairs

我国的内政

Domestic flights (=flights that stay inside a particular country) go from Terminal 1.

国内航班从一号航站楼起飞。

[only before noun] relating to family relationships and life at home

家庭的; 家事的:

Unfortunately his domestic life wasn't very happy.

不幸的是他的家庭生活并不幸福。

Nowadays there is more sharing of domestic chores.

如今分担家务已变得更为常见了。

families that can afford domestic help (=help with cleaning, washing etc)

请得起人帮忙做家务的家庭

an organization that supports women facing domestic violence (=violence in a family, especially from a husband to his wife)

对面临家庭暴力的妇女提供援助的组织

used in people's homes

家用的:

a new tax on domestic fuel

对家用燃料征收的一种新税

domestic appliances such as washing machines

洗衣机之类的家用设备

someone who is domestic enjoys spending time at home and is good at cooking, cleaning etc

喜爱家庭生活的; 善于操持家务的:

No, I'm not very domestic.

不，我不大喜欢做家务。

[only before noun] a domestic animal lives on a farm or in someone's home

驯养的，家养的:

domestically produced coal

国内出产的煤

[old-fashioned] a servant who works in a large house

〔大宅内的〕仆人，用人

[BrE informal] a fight between members of a family in their home

家庭纠纷，家庭矛盾:

It sounded like the neighbours were having a bit of a domestic.

听起来好像是邻居们发生了家庭纠纷。