What does the word 'Reiki' actually mean, and where does the term come from?
Answered by Vanessa Chugani · Updated September 2026
"Reiki" is Japanese: "rei" is usually translated as universal, and "ki" means life energy, the concept behind chi and qi in other traditions. The word describes the system that reached the West through Hawayo Takata, who trained with Chujiro Hayashi, who trained with Mikao Usui in Tokyo in the 1920s.
People usually ask this after a first session, once the word itself starts to feel like it deserves an explanation. Reiki is a Japanese word built from two parts, and knowing what they mean makes the practice feel ordinary, not mysterious.
What "rei" and "ki" mean
"Rei" is usually translated as universal, though older renderings lean closer to spiritual or mysterious. "Ki" means life energy, the same idea behind qi in Chinese medicine and prana in yogic tradition. Ki was not invented for this practice. It is a much older piece of everyday Japanese: the same kanji sits inside "genki", meaning vitality or wellbeing, and "tenki", meaning weather. Reiki simply points that familiar word at a specific practice.
Where the name comes from
Mikao Usui taught in Tokyo in the 1920s. His student Chujiro Hayashi carried the practice forward, and Hayashi's student Hawayo Takata brought it to the West. The form she taught is called Usui Shiki Ryoho, and that line, Usui to Hayashi to Takata, is the one behind every training and session I offer. I hold this lineage as a Reiki Master Teacher, trained in Chiang Mai in 2019, and everything I teach traces back through the same three names. Some of the wider history around Usui's own school in Japan is genuinely contested, and this page will not adjudicate it. I can tell you the line I stand in, and stop there.
What the word means once you're in the room
None of that history changes what happens on the table. A session is rest and support for a nervous system that has been running hot for a while: stressed and wired at 2am, carrying more than feels manageable. Most of the tension people arrive with sits on top of that: a locked jaw and shoulders up by the ears, or a chest that will not open. That is exactly the kind of thing the word describes when it gets put to use. It is not a diagnosis and not a substitute for medical care, and I do not claim to know the mechanism behind it. What I can tell you is what people report afterwards: sleep that comes more easily and a body that finally settles, feeling steadier by the time they leave.
Who tends to ask this question
Often someone who wants to understand what they are walking into before they book it, which is exactly the right instinct. It comes up especially from people weighing training rather than a single session, sometimes as a second career after years of doing something else. Knowing the word is a small piece of arriving with accurate expectations rather than romantic ones. If that is you, a private session is a reasonable next step, or take a look at the other questions people bring me.
Related questions
Is Reiki a religion?
Reiki is not tied to any religion. Ki is a concept that appears across Japanese medicine, martial arts and everyday language, not a religious claim, and Usui Shiki Ryoho does not ask you to believe anything in particular before a session.
What's the difference between "Reiki" and "Usui Shiki Ryoho"?
"Reiki" is the general word for the practice, the one most people use in conversation. "Usui Shiki Ryoho" is the name of a specific lineage, the one that runs from Mikao Usui through Chujiro Hayashi and Hawayo Takata to me. Every training and session here follows that line specifically, not a generic version.
Does the meaning of the word tell you what Reiki does?
Not completely. Knowing that "ki" means life energy explains the name, but it does not explain the mechanism, and I don't claim one. What I can describe is what people report: a nervous system that settles, sleep that comes back, less alone with whatever they walked in carrying.