Age uke - Rising block. Also known as high, or upper block.
Ago - Jaw/chin
Ai - Harmony
Aikidoka - Student of Aikido
Aikido - Martial Art style formed by Morihei Ueshiba taking techniques from many styles, including Daito-Ryu Aiki-Jutsu. Literally translated as 'The way of Spiritual Harmony'.
Aikijutsu - 'Technique of harmonious spirit'. A branch of ancient Ju Jutsu, from which Aikido was developed.
Aite - Opponent
Ajime - Strangle, or choke.
Arashi - Storm
Arigato - Hello or thankyou
Ashi - Foot/leg
Ashi gatame - Leg lock
Ashi no ura - Sole of the foot
Atama - Head, or more specifically, top of head.
Atemi - Strike i.e. Atemi Waza - 'striking techniques'