Basic Terminology

Counting

ichi - one
ni - two
san - three
shi - four
go - five
roku - six
shichi - seven
hachi - eight
kyu - nine
ju - ten

Roles

uke - the one who receives the technique; the attacker
nage - the one who performs the technique

Stance and Movement

hanmi - stance in ready position
ai-hanmi - asymmetric stance, uke and nage have same feet forward (both left or both right)
gyaku-hanmi - symmetrical stance (mirror image), uke and nage have opposite feet forward
ma ai - distance between uke and nage
irimi - entering
tenkan - turning (usually 180 degrees)
omote - the front (entering to uke's front)
ura - the rear (entering behind uke)
seiza - kneeling
tachi-waza - standing techniques
suwari-waza - kneeling techniques
hamni-handachi - nage kneeling, uke standing
ukemi - roll, break-fall
mae-ukemi - forward roll
ushiro-ukemi - backward roll
shikko - knee walking
hara - centre
kokyu - breath

Attacks

shomen-uchi - vertical strike to the front of the head
yokomen-uchi - horizontal blow to the side of the head
tsuki - straight punch
katate-dori - one hand wrist grasp
ryote-dori - both wrists grasp
ushiro-ryotekubi-dori - both wrists grasp from behind
morote-dori - two hands grasp one wrist
kata-dori - shoulder grasp
ushiro-ryokata-dori - both shoulders grasp from behind
mune-dori - chest (collar) grasp

Techniques

ikkyo - first pinning technique (arm pin)
nikyo - second pinning technique (wrist turn)
sankyo - third pinning technique (wrist twist)
yonkyo - fourth pinning technique (wrist pin)
gokyo - fifth pinning technique (arm extension)
kotegaeshi - reversed wrist
irmi-nage - inward throw
kaiten-nage - rotation throw
kokyu-nage - breath throw
koshi-nage - hip throw
juji-garami - cross arm lock throw
shiho-nage - four direction throw
tenchi nage - heaven and earth throw
atemi - strike to the body
tai-no-tenkan - body turn (turning exercise)
kokyu-ho - breath power exercise
kokyu-dosa - breath extension exercise

Equipment

dogi - training uniform
obi - belt
hakama - wide black pants worn by high-rank aikidoka
zori - sandals
dojo - practice hall
tatami - mats
bo - staff
jo - short staff
bokken - wooden practice sword
tanto - knife