Karate is taught in a dojo. Just about any place can serve as a dojo, even a space outdoors. Many places share space with dance studios, health and fitness clubs, churches and schools.
There are no requirements for size. Minimum is enough room for one person to do a kata in. Many of the dojo in Okinawa are only three or four tatami mats. Ideally there is enough room for a class of ten or twelve students to observe the teacher and follow along on a kata.
Not unless it is at the start of a sentence or part of a formal name. Karate is studied in a dojo. He went to the dojo to study karate. He studies Shidokan Karate.
The place to learn karate is called the dojo.
karate school, or a dojo...
It literally means the dojo code. They are some rules which all karate practitioner have to follow. You can see them in front of your dojo. They highlight the expectations from a karateka and what s/he is disallowed to do in his/her dojo.
Dojo.
dojo
a dojo
dojo
Although karate can be performed anywhere, it is most commonly done in a dojo.
It's relatively easy to get involved in karate. The challenge is finding a dojo that you like and suits you.