Buddha (Skt.; Tib. སངས་རྒྱས་, Sangyé, Wyl. sangs rgyas), usually refers to Shakyamuni Buddha, the Indian prince Gautama Siddhartha, who reached enlightenment in the sixth century B.C., and who taught the spiritual path followed by millions all over Asia, known today as Buddhism. Buddha, however, also has a much deeper meaning. It means anyone who has completely awakened from ignorance and opened to his or her vast potential for wisdom. A buddha is one who has brought a final end to suffering and frustration and discovered a lasting and deathless happiness and peace.
The Tibetan term for Buddha, སངས་རྒྱས་, Sangyé, is explained as follows:
- སངས་, Sang means ‘awakening’ from the sleep of ignorance, and ‘purifying’ the darkness of both emotional obscurations and cognitive obscurations.
- རྒྱས་, Gyé means ‘opening’, like a blossoming lotus flower, to all that is knowable, and ‘developing’ the wisdom of omniscience—the knowledge of the true nature of things, just as they are, and the knowledge of all things in their multiplicity.
The Seventy Verses on Taking Refuge says:
- One who sleeps no more in ignorance,
- And in whom genuine wisdom is brought forth,
- Has truly awoken as an awakened buddha,
- Just as one wakes from ordinary sleep.
As it says, ‘awakened’ means that ending the slumber of ignorance is like waking from sleep. And:
- Their minds have opened to all that is knowable,
- And they have overcome the tight seal of delusion,
- So the awakened have blossomed like lotus flowers.
As it says, they are like ‘blossoming’ lotus petals in the sense that through their genuine wisdom they have overcome the tendency to ‘shut down’ through lack of knowledge, and their minds are open to all that can be known.
Kayas & Wisdoms
Buddhas are spoken of in terms of the kayas and wisdoms.
The three 'bodies' of a buddha. They relate not only to the truth in us, as three aspects of the true nature of mind, but to the truth in everything. Everything we perceive around us is nirmanakaya; its nature, light or energy is sambhogakaya; and its inherent truth, the dharmakaya.
- wisdom of dharmadhatu
- mirror-like wisdom
- wisdom of equality
- wisdom of discernment
- all-accomplishing wisdom
Sogyal Rinpoche writes:
- You can also think of the nature of mind like a mirror, with five different powers or 'wisdoms.' Its openness and vastness is the wisdom of all-encompassing space [or dharmadhatu], the womb of compassion. Its capacity to reflect in precise detail whatever comes before it is the mirror-like wisdom. Its fundamental lack of any bias toward any impression is the equalizing wisdom [or wisdom of equality]. Its ability to distinguish clearly, without confusing in any way the various different phenomena that arise, is the wisdom of discernment. And its potential of having everything already accomplished, perfected, and spontaneously present is the all-accomplishing wisdom. 
These five wisdoms may be condensed into two:
- ‘the wisdom that knows the nature of all phenomena’ which comprises the wisdom of the dharmadhatu, mirror-like wisdom and the wisdom of equality; and
- ‘the wisdom that knows the multiplicity of phenomena’ which comprises discriminating and all-accomplishing wisdom.
They can all be condensed into a single wisdom: the wisdom of omniscience.
Supreme nirmanakaya buddhas display the twelve deeds:
- the descent from Tushita, the Joyous pure land (dga' ldan gyi gnas nas 'pho ba),
- entering the mother’s womb (lhums su zhugs pa),
- taking birth (sku bltams pa),
- becoming skilled in various arts (bzo yi gnas la mkhas pa),
- delighting in the company of royal consorts (btsun mo'i 'khor dgyes rol ba),
- developing renunciation and becoming ordained (rab tu byung ba),
- practicing austerities for six years (dka' ba spyad pa),
- proceeding to the foot of the bodhi tree (byang chub snying por gshegs pa),
- overcoming Mara’s hosts (bdud btul ba),
- becoming fully enlightened (mngon par rdzogs par sangs rgyas pa),
- turning the wheel of Dharma (chos kyi 'khor lo bskor ba), and
- passing into mahaparinirvana  (mya ngan las 'das pa)
Eight Qualities of a Buddha
Benefit of self:
1) Self-arisen wisdom
2) Unconditioned body
3) Spontaneously perfect
Benefit of others:
And 7) the benefit of self and 8) the benefit of others.
How a Buddha teaches
- The Tibetan Book of Living and Dying, p. 157
- In the case of Buddha Shakyamuni, this was in the Lumbini garden.
- In the case of Buddha Shakyamuni, this was in the city of Kushinagara.
- Patrul Rinpoche, Preliminary Points To be Explained when Teaching the Buddha's Word or the Treatises, translated by Adam Pearcey.