Kodo in Chinese / Japanese...

講道館 is a title that refers to a certain kind or school of Judo martial arts.

Here's how the characters break down in meaning for this one:
1. Mutual Assistance or Association. Can also refer to a lecture, speech, or explaining something (as in teaching).
2. Way / Path (the Tao/Dao as in Taoism/Daoism)
3. Schoolroom / Building / Establishment / Mansion / Small Castle / Hall (of learning)

Altogether, you get something like, “The Path of Mutual Learning Hall.”

More about Kodokan from the Institute of Kodokan.

弘道館 is a Japanese title that romanizes as Kodokan.

There are a few martial arts titles that are romanized as Kodokan, so be careful to choose the correct one. This one kind of means “Great Way Hall.”

In the old Buddhist context, the 弘 Kanji can mean vast, great, to enlarge, spread abroad, or widely to proclaim.

The 道 part is the “Way,” as seen in many martial arts titles. It is the root character of Taoism/Daoism (romanized as Tao or Dao from Chinese, but Do in Japanese).

The 館 or hall part is implied to be a dojo or place of learning.

光道館 is Kodokan.

This is the title of an Aikido dojo, studio, or hall.

Be careful in selecting the correct Kodokan, as there are a few different titles that romanize as Kodokan.

Here's how the characters break down in meaning for this one:
1. Light / Bright
2. Way / Path (the Tao/Dao as in Taoism/Daoism)
3. Schoolroom / Building / Establishment / Mansion / Hall (of learning)

Altogether, you get something like “The Path of Light Establishment.”

光道館合気道 / 光道館合氣道 is Kodokan Aikido.

Be sure this is the right Kodokan for your school, as there are two different titles that romanize as Kodokan in Japanese.

講道館護身術 is the title for Kodokan Goshin Jutsu (or Jitsu) in Japanese Kanji.

講道館柔道 is the title for the Kodokan Judo school of Japanese martial arts.

旧弘道館 is the Japanese title, Kyukodokan.

kind of means “Old Great Way Hall.” The hall part is kind of implied to be a dojo or place of learning.