Avidya – Ignorance, which is forgetfulness.  It is the forgetting of our true Self and attachment to the material world around us.
Aham Brahmasmi - I am the creative principle.  It acknowledges that we are the creators of our own environment, our perception, our world, emotionally, mentally and physically. 
Aham-kara - The ego, which is transitory and unreal.  It is a necessary evolutionary stage in our spiritual unfolding.
Ahimsa – Non-violence. One of the Yamas or restraints.
Ananda - The Bliss and Liberation of the real Self.
Aparigraha – Non-greed. One of the Yamas or restraints.
Asanas. Yoga postures. It literally means "easy pose" or "comfortable position."
Asteya – Non-stealing. One of the Yamas or restraints.
Atma - The Experiencer, Consciousness, the Self, the Spirit within.
Bindu -  A dot in the center that symbolizes Self-conscious awareness.
Brachmacharya – Non-lust, Celibacy. One of the Yamas or restraints.
Brahman - The absolute. Divinity itself
Buddhi - The intellect.
Chakras -  Centers of radiating life force or energy that are located between the base of the spinal column and the crown of the head. The Seven Major Chakras are: Muladhara Chakra (Saturn) – pelvic area, Svadhisthana Chakra (Jupiter) – small of the back, Manipuraka Chakra (Mars) – navel region, Anahata Chakra (Venus)  - heart region, Vishuddha Chakra (Mercury) –  throat region, Chandra Chakra (Moon) – back of the head, Ajna Chakra (Sun) – between the eyebrows, Sahasrara Chakra – the thousand petalled lotus – top of the cerebral cavity.
Chitta - Mind-stuff, linked to this body and it is made of prakriti.
Dharana - Concentration or holding the mind to one thought.
Dharma - The quintessence of a thing, for example the heat of the sun.
Dhyana -  Meditation or contemplation. The process of quieting the mind.
Gunas – Qualities that show up in the subtle body but are affected by the astral body.  Three qualities of nature (prakriti): sattva (clarity or purity), rajas (passion or activity), and tamas (darkness or inertia).
Guru. Spiritual teacher, described as the “dispeller of darkness.”  Also, the guru is the spiritual God within us.
Hatha yoga -  Hatha means willpower, resoluteness and perseverance; and Hatha yoga is the path that develops these qualities and leads one, towards emancipation.  The word Hatha is composed of two syllables: ha and tha.  Ha stands for the seer, the Self, the soul (purusa), and for the sun (Surya) and the inbreath (prana). Tha represents nature (prakrti), consciousness {citta), the moon (chandra) and the outbreath (apana).  Yoga, means union.  Hatha yoga, therefore, means the union of purusa with prakrti, consciousness with the soul, the sun with the moon, and prana with apana.
Ishvar-Pranidhana – Attunement to God. One of the Niyamas, or observances.
Japa - The repetition of a mantra. 
Karma - Action, the Law of Causation where everything is caused. 
Karma Yoga - Doing something, performing action, duty, deeds detachedly for the welfare of others to attain self-awareness. 
Kriya-mana-karma. The karma we create in this lifetime.  
Kriya Shiva Yoga. The yoga of the dream state
Kriya Yoga – eight stages: Yama (abstentions), Niyama (Observances), Asan (Posturesa), Pranayama (Life-force control), Pratyahara (Sense-withdrawal), Dharana (Concentration), Dhyana (Meditation), Samadhi (Contemplation)
Kundalini -  Cosmic energy in the body.
Mantra - A thought form that brings something into manifestation, into existence.  These thought forms are the way in which we create our world.
Maya-shakti.  The divine energies of dreams, of illusion, the power of non-permanence
Meditation. Meditation is a non-peripheral, linear, effortless flow of the mind.  The key word is effortless.  It is an effortless movement; emphasis is on both words, effortless and movement.  Meditation (Dhyana) contains three separate concepts:

1. Mindfulness which is the calming of the mind and senses in order to achieve one-pointedness of thought.
2. Concentration which is narrowing of the attention by one’s own will.  The focus gives a degree of stability to the movement of the mind.
3. Wisdom is the “somethingness” that penetrates and destroys the darkness of delusion, thus allowing us to see life and the world as it really exists.  Ultimately, wisdom concerns iteself with Reality, the meaning of life and the conduct of life.

Mokesha  - Liberation
Mudras - Hand gestures that direct the life current through the body.
Namaste. This expression, used on meeting or parting, is generally accompanied by holding the palms together in front of the chest. It is pronounced NUM-ah-stay. There are several meanings to putting your hands together in pronam.

1. I have the capacity of bringing myself together, of balancing, harmony.
2. I bow to the God in you, the realization that you are God and a reverence and recognition that we are equal.
3. It’s a symbol of Shanti.
4. The this and the that, the doer and the doing coming together.
5. The universe is a dual system – purusha and prakriti.

Neti-neti - Neti, neti, neti means not this thought.  It’s a reminder to not identify with the ahamkara.  The Self is greater than our thoughts, emotions and identifications and we need to remember that.
Nirguna Brahman - Reality or God without form or attributes.  This is the Reality we seek to have a oneness with through Samadhi.
Niyamas. In the Yoga Sutras, Patanjali defined five niyamas or observances. The five observances are: Purity (shaucha), Contentment (santosha), Austerity (tapas), Study of the holy texts (svadhyaya), Attunement to God (Ishvar-Pranidhana)
Om or Aum. Mantric word chanted in meditation. A symbol of Reality.  The first sound of the universe.
Pralabdha Karma.  The Karma that will fructify in this lifetime.
Prakriti - Matter, insentient in nature, including the mind.  Even karmic residue is made of matter.
Prana - Life energy or mystical force.
Pranayama. Method of controlling prana or life force through the regulation of breathing.
Pratyahara. Withdrawing the senses in order to still the mind as in meditation.
Purusha  -  Spirit, pure consciousness, the Self.  It our work to regain our God-consciousness through balanced self-awareness.
Sadhana - A series of yogic techniques.\
Saguna Brahman - Reality or God with attributes such as Brahma, Buddha or Jesus Christ.
Santosha – Contentment. One of the Niyamas, or observances.
Satya. Truthfulness and honesty (one of the yamas).
Samadhi. State of absolute bliss, superconsciousness.
Samskara. The predisposition to think or not think something, to feel or not feel something, to do or not do something.
Sanchitta Karma.  The storage tank of all Karma.  Some of that Karma is taken from the tank for each lifetime and will leave with very little modification.       
Satya – Truthfulness. One of the Yamas or restraints.
Shaucha – Purity. One of the Niyamas, or observances.
Shodhana. Yogic cleansing ritual.
Siddhi - Occult power or Divine power.
Svadhyaya – Study of the holy texts. One of the Niyamas, or observances.
Swami. Title of respect for a spiritual master.
Tapas – Austerity. One of the Niyamas, or observances.
Tapas  - The conserving of energy. The practices which produce energy. That which generates heat.  Kriya or kundalini flows, produce heat and that heat burns out an enormous amount of things called karma.  Tapas generate a special type of spiritual energy that pulls the energy out of the negative emotions and tries to pump that positive energy into positive emotions
Yamas. In the Yoga Sutras, Patanjali defined five yamas or ways to relate to others — moral conduct. The five restraints are: Non-violence (ahimsa), Truthfulness (satya), Non-stealing (asteya), Celibacy (brahmacharya), Non-greed (aparigraha)
Yoga - To yoke or join two things.  In Kriya Yoga, we are trying to join the individual spirit with the great Spirit.
Yogi -  Someone who practices yoga. (A female yoga is called a yogini.)
Yogini – A female who practices yoga.