reiki Syllabification: (rei·ki)Pronunciation: /ˈrākē/Definition of reiki noun a healing technique based on the principle that the therapist can channel energy into the patient by means of touch, to activate the natural healing processes of the patient’s body and restore physical and emotional well-being. Origin:Japanese, literally 'universal life energy'reiki in other Oxford dictionaries Definition of reiki in the British & World English dictionary