Definition of First degree murder
Murder committed with deliberately premeditated malice aforethought, or with extreme atrocity or cruelty, or in the commission or at tempted commission of a crime punishable with death or imprisonment for life, is murder in the first degree. State v. McLaughlin, 286 N.C. 597, 213 S.E.2d 238, 244. Distinction between "first degree murder” and "second degree murder” is a presence of a specific intent to kill. Com. v. O’Searo, 466 Pa. 224, 352 A.2d 30, 38. See also Murder; Premeditation.
That's the definition of First degree murder in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.