Japanese is used in the Dojo for all karate instructions, 
counting and greetings

Counting

1-Ichi (itch) 6-Roku (rook) 20-Nijyu (nee-joo) 70-Shichijyu (shitch-joo)
2- Ni (nee) 7-Shichi (shitch) 30-Sanjyu (sahn-joo) 80-Hachijyu (hatch-joo)
3-San(sahn) 8-Hachi (hutch) 40-Yonjyu (yon-joo) 90-Hujyu (koo-joo)
4-Shi (she) 9-Ku (koo) 50-Gojyu (go-joo) 100-Hyaku (he-ah-koo)
5-Go (go) 10-Jyu (joo) 60-Rokujyu (rook-joo)  

     Greetings and Courtesy

Osu   (pronounce it..'Oos')

This is possibly the single most used word in the Dojo.  Used as an acknowledgement  or motivator - it gets students to USE their voice - to shout! It helps to generate a strong spirit in the club. Also to highlight a technique or point in competition, and importantly, to generate physical power - from breathing out whilst exerting, and inner power from correct breathing from the diaphram. Literally, it means to push, or to endure 'ones self'.

Said with a bow on entering and leaving the dojo.

On  receiving any instruction or advice from the instructor. 

When bowing at the start and finish of the class.

When bowing to your partner during kumite.

As 'Thanks', as an affirmation, and as the Kiai.  
Sensei ni, Rei Bow to Teacher (with a loud Osu)
Senpai ni, Rei Bow to Senior
Otagai ni, Rei Bow to each other
Domo arigato gozaimashita Thank you very much

Blocks - Level, Target or Direction

Chudan Middle Level
Gedan Lower Level
Jodan Upper Level
Mae forward
Mawashi Roundhouse
Morote Double
Uchi Inside
Soto Outside

Weapon or Technique

Barai Parry/Sweep
Haito Inner knife hand
Hiji Elbow
Juji Crossed
Kake Hooking
Koken Wrist top
Osae Holding down
Shotei Palm heel
Shuto knifehand
Uke Block

Kicks - Level, Target or Direction

Ago Chin or jaw
Ashi Barai Foot sweep
Chudan Middle level
Gammen Face
Gedan Lower level
Jodan Upper level
Kansetsu Joint
Keage Rising
Kin Groin (Testicles)
Mae Front
Mawashi Roundhouse
Oroshi Descending
Soto Outside
Tobi Jumping
Yoko Side
Uchi Inside
Ushiro Back

Weapon or Technique

Chusoku Ball of the foot
Geri Kick
Haisoku Instep
Hiza Knee
Kakato Heel
Kake Hook
Sokuto Foot edge
Sune Shin
Teisoku Arch of the foot

Strikes - Level, Target or Direction

Age Rising
Ago Chin or jaw
Chudan Middle level
Gammen Face
Gedan Lower level
Gyaku Reverse
Hizo Spleen
Jodan Upper level
Mae Forward
Mawashi Roundhouse
Morote Double
Oi Lunge
Oroshi Descending
Sayu Left and right
Shoman Front
Yoko Side

Weapon or Technique

Haito Inner knife hand
Haisho Back hand
Hiji Elbow
Hiraken Flat fist
Ippon Nukite Single finger spearhand
Keiko Wrist top
Komekami Temple
Nakyubi Ippon Ken Middle finger knuckle fist
Nihon-Nukite(Me-Tsuki) Two finger spearhand
Nukite Spearhand
Ouayubi Ippon Ken Thumb knuckle fist
Ryutoken Dragon's head fist
Sakotsu Collarbone
Seiken Forefist
Shotei Palm heel
Shita Lower
Shuto Knife hand
Tate Vertical
Tettsui Bottom fist or fist edge
Tsuki Punch
Toho Sword Peak hand
Uchikomi Thrust
Uraken Back fist
Uchi Strike
Yonhon Nukite Four finger spearhand

Stances

Fudo Dachi Formal stance
Heiko Dachi Parallel stance
Heisoku Dachi Parallel closed stance
Kake Dachi Hooked stance
Kiba Dachi Horse straddle stance
Kokutsu Dachi Back leaning stance
Morashi Dachi One foot forward stance
Musubi Dachi Toes open stance
Nekoashi Dachi Cat stance
Sanchin Dachi Three point stance
Soshin Dachi Outstretched leg/Crouching stance
Tsuruashi Dachi Crane stance
Uchi Hachji Dachi Figure of eight stance
Yoi Dachi Ready stance
Zenkutsu Dachi Forward leaning stance