Malice aforethought
Malice aforethought was the "premeditation" or "predetermination" (with malice) that was required as an element of some crimes in some jurisdictions, and a unique element for first-degree or aggravated murder in a few. Insofar as the term is still in use, it has a technical meaning that has changed substantially over time.
Legal history
Malice aforethought was the mens rea element of murder in 19th century America, and remains as a relic in those states with a separate first-degree murder charge.
As of 1891, Texas courts were overwhelmed with discussing whether "malice" needs to be expressed or implied in the judge's jury instructions. However, the 1970s revision of the Texas Penal Code corrected this as "intentionally or knowingly" are the requisite mental state for murder in Texas. See Texas Penal Code Section 19.02.
Modern law
England
In English law the mens rea requirement of murder is either an intention to kill or an intention to cause grievous bodily harm. In R v Moloney [1985], Lord Bridge held that, intent, as defined in the mens rea requirement of murder 'means intent,' therefore the jury should simply use the term intent legally as they would in normal parlance. Furthermore, in Moloney, Lord Bridge held that, for the defendant to have the mens rea of murder, there must be something more than mere foresight or knowledge that death or serious injury is a "natural" consequence of the current activities: there must be clear evidence of an intention. This element of intention is not only fulfilled when the defendant's motive or purpose was to cause death or serious bodily harm (also known as 'direct intent,') but also when the defendant's motive or purpose was not to cause death or grievous bodily harm, but (as held by Lord Steyn in R v Woollin) death or serious bodily harm was a 'virtual certainty' of the defendant's act, and the defendant appreciated this to be so (also known as 'oblique intent.')