Uchi - A striking attack
Tsuki - A punch with the fist or thrust with the jo
Dori - Grabbing or seizing
Tori - Grabbing or seizing
Shime - Grabbing or seizing
Ai dori - Cross hand grab
eri dori - Collar grab from behind
Hiji dori - Elbow grab
Kata dori - Shoulder grab
Kata menuchi - Shoulder grab and strike
Katate dori - Single wrist grab
Menuchi - Strike to the head
Morote dori - Grabbing the wrist with both hands
Mune tsuki - A punch with the fist or thrust with the jo to the chest or stomach
Ryote dori - Grabbing both hands
Shomen uchi - Strike to the top of the head.
Shome tsuki - Strike, thrust to face
Tsuki - A punch with the fist or thrust with the jo
Ushiro dori - Rear bear hug
Ushiro katate-dori-kubi-shime - Rear choke with one wrist held
Ushiro ryo-hiji-dori - Both elbows grabbed from the rear
Ushiro ryo-kata-dori - Both shoulders grabbed from the rear
Ushiro ryote-dori - Both wrists grabbed from the rear
Ushiro ryo-tekubi-dori - Both wrists grabbed from the rear
Yakote dori - Cross hand grab
Yokomen uchi - Strike to side of the head
Ikkyo - Involves controlling your partner's center through the arm, as well as pinning the arm flat on the mat. Literally, first teaching or first principle.
Nikyo - Involves manipulating the wrist and pinning the arm vertically. Literally, second teaching or second principle.
Sankyo - Involves twisting the wrist and arm in a third way, pinning the arm vertically, and torquing the hand and wrist. Literally, third teaching or third principle.
Yonkyo - An arm pin involving leverage on the underside of the arm and elbow, while attacking the nerve points there. Literally, fourth teaching or fourth principle.
Gokyo - Similar to ikkyo but with a change in the position of the hands. Literally, fifth teaching or fifth principle.
Kote Gaeshi - Involves throwing partner by folding the hand back over the wrist. Literally, small hand (kote) turn over (gaeshi).
Shiho Nage - A throw in which partner may be thrown in any direction. Literally four (shi) direction (ho) throw (nage).
Irimi Nage - A throw involving entering through an attack to get behind your partner and take his balance. Literally, to enter (iri) body (mi) and throw (nage).
Koshi Nage - Throwing your partner by rotating his body over the back of your hips. Literally, hip (koshi) throw (nage).
Kaiten Nage - Throwing your partner as if he were a big wheel. Literally, rotation (kaiten) throw (nage).
Juji Nage - Throwing your partner by using leverage on his cross arms. Literally, cross (juji) throw (nage).
Tenchi Nage - Throwing by extending your arms around and behind your partner's body, one down toward the mat and the other up toward the ceiling. Literally heaven (ten) earth (chi) and throw (nage).
Kokyu Nage - Any sort of throw that relies essentially on blending and flowing with your partner's movement and upsetting his balance, rather than any specific movement. Often used for throws that have no specific name. Literally, breath (kokyu) throw (nage).
O Sensei said the techniques of Aikido rest on six pillars:
Shiho Nage - Four direction throws
Irimi Nage - Entering throws
Kaiten - Open and turn movements
Kokyu Ho - Breath power techniques
Osae Waza - Pinning techniques
Ushiro Waza - Rear techniques
Shiho Nage represents the gratitude Aikido trainees feel toward life in all four directions, and it is commonly the first technique practiced by new students.
Irimi means to enter, physically and spiritually, into an attack, while simultaneously sidestepping it. Entering must be straight, sharp and true.
Kaiten is also described as kaiku, "turn and transform," instantaneously adjusting to any attack. In Kaiten, one must open the heart and turn around aggression. The most common application of kaiten is kote gaeshi.
Kokyu Ho, or breath power. O Sensei said breath is the thread that ties creation together. When the myriad variations of breath in the universe can be sensed, the individual techniques of Aikido are born. At one time Kokyu Ho
techniques were not taught publicly because they were believed to contain the secret of true power.
Osae Waza, or pinning techniques. Pins represent perfect control and the proper resolution of a technique. Pins also have a therapeutic effect, stretching and stimulating the partner's muscles and joints. Good, focused pinning is one of the benefits of Aikido training. It's like getting physical therapy. Shomen Uchi Ikkyo is pin number one, involving containment of the elbow.
Ushiro Waza, rear techniques. O Sensei said that through the practice of rear techniques one learns how to train one's mind and body against attacks from all directions. Rear techniques open the window of one's mind and develop one's sixth sense.
For another good reference, go to Aiki Web's Attacks and Defenses.