Terminology
When karate first left the Japanese dojo and entered the world arena the instructors often did not speak the language of their new host country. Even today, within the traditional dojo environment, you will often hear instructions given in Japanese. These include the names of techniques, counting, greetings, acknowledgements and The Dojo Kun. This can seem, especially to the newer student, an unnecessary complication in addition to everything thing else there is to learn. However, after several lessons the new words should start to become a part of a students vocabulary. The following phrases will be common in the dojo; you may be surprised how many are already familiar to you.
Counting in Japanese

You may be occasionally asked to count during a lesson. When asked to do so the student should whenever possible attempt to count in Japanese. This should be done in a loud clear voice so that all present may hear, although care must be taken not to shout as this may appear disrespectful.
If you are asked to count out punches for example, try to keep the count even and before execution of the technique. It is perfectly possible to count up to 99 in Japanese by learning the numbers through one to ten, then remembering the correct combination for twenty, thirty, forty etc.
The numbers one through ten are pronounced as follows:
one ichi
two ni
three san
four shi
five go
six roku
seven shichi
eight hachi
nine kyu
ten ju
Above ten the numbers are pronounced differently and translated as 10 +1
eleven ju ichi
twelve ju ni
thirteen ju san
fourteen ju shi
fifteen ju go
sixteen ju roku
seventeen ju shichi
eighteen ju hachi
nineteen ju kyu
Above twenty the numbers are pronounced differently and translated as 2 tens. So twenty one would be 2 tens + 1.
twenty ni ju
twenty one ni juichi
twenty two ni juni
For example thirty four would be san jushi or seventy eight shichi juhachi.
The number 100 is pronounced hyaku.
Instructions/Names

Osu - Yes/No/I understand/I don't understand.
Dojo - Training hall
Gi - Karate uniform
Obi - Belt
Yoi - Ready
Sensei - Teacher
Sempai - Senior Student
Hajime - Begin
Yamae - Stop
Rei - Bow
Kiai - Shout

Jodan - Face Area
Chudan - Chest Area
Gedan - Groin Area
Mawate - Turn
Motsu - Eyes Closed
Sei Za - Kneel
Kata - Form
Kumite - Sparring
Kihon - Basics
Wazari - Half Point
Ippon - Full Point
Migi -Right Hand Side
Hidari - Left Hand Side

Uchi - Strike
Geri - Kick
Uke - Block
Dachi - Stance
Zenkutsu Dachi - Forward Stance
Kiba Dachi - Horseriding Stance
Ko Kutsu Dachi - Back Stance
Gedan Barai - Downward block
Age Uke - Upper Rising Block
Ude Uke - Inside Forearm Bloke
Soto Uke - Outside Forearm Block
Shuto Uke - Knife Hand Block
Choku Tzuki - Straight Punch
Oi Tzuki - Lunge Punch
Gyaku Tzuki - Reverse Punch
Kizami Tzuki - Jab Punch
Mai Geri - Front Snap Kick
Mawashi Geri - Roundhouse Kick
Yoko Geri Kekomi - Side Thrust Kick
Yoko Geri Keage - Side Snap Kick
Ushiro Geri - Reverse Thrust Kick
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Dojo Kun

Karate Do!
Kokoro Tadashiku!
Nichi Nichi No, Keiko!
Rei Tu Setsu!

Literal Translation of the Dojo Kun

We must acknowledge, consider and
dedicate ourselves to the true way of
karate and practice with good mind
and spirit on all occasions.
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The Dojo Kun is recited at the conclusion of every karate training, allowing the students to reflect upon the guiding principles of karate-do.