Terrorism hasn’t always been a household word. Terrorism has a terrifying history, emerging in the English language at the end of the 18th century, with terrorize showing up in the mid-19th century, and terrorist in the mid-20th. Until the start of the 21st century the word was used in news and novel accounts of atrocious injustices ( 1790s France, 1860s Russian revolution, and 1940s Maquis of France), but it was signed into law at the start of the 21st century with the P.A.T.R.I.O.T. (Providing Appropriate Tools Required to Intercept and Obstruct Terrorism) Act.
It’s right to call domestic violence Terrorism. Pick your dictionary, but the general consensus defines terrorism as the systematic use of extreme fear, especially as a means of intimidation and coercion. There are no cultural, political, religious, or social restrictions placed on the word. It isn’t limited to acts in majority-Muslim nations, or the Mansons and McVeighs of the western world. It is what it is - Domination by Fear.