The cross-government definition of domestic violence and abuse is:
any incident or pattern of incidents of controlling, coercive, threatening behaviour, violence or abuse between those aged 16 or over who are, or have been, intimate partners or family members regardless of gender or sexuality. The abuse can encompass, but is not limited to:
Controlling behaviour is a range of acts designed to make a person subordinate and/or dependent by isolating them from sources of support, exploiting their resources and capacities for personal gain, depriving them of the means needed for independence, resistance and escape and regulating their everyday behaviour.
Coercive behaviour is an act or a pattern of acts of assault, threats, humiliation and intimidation or other abuse that is used to harm, punish, or frighten their victim.
This is not a legal definition.
Sexual violence is any unwanted sexual act or activity. There are many different kinds of sexual violence including rape. Sexual violence can be committed by a stranger, or by someone known and trusted, such as a friend, colleague, or family member. Sexual violence can also take place within relationships and marriages. Anyone of any age can be the victim of sexual violence, assault or abuse.