Separately, 'do' can be 度 [counter for degrees, counter for times/frequency] and 土 [meaning 'earth, soil', in general, read 'tsuchi' when alone, and read 'do' in compound nouns like 'doyoubi' (Saturday) and it can be abbreviation for Saturday].
'Jitsu' alone, means 'truth, reality'.
If you mean the two together, 'dojitsu' is not a word, the correct way to romanize it would be 'doujitsu' meaning 'the same day, the very day of'.
If you by chance mean 'doujutsu' like the term in Naruto anime it is written 瞳術, consisting of 瞳 [meaning 'eye, pupil', generally read 'hitomi' alone and 'dou' in compound nouns] and 術 [meaning 'technique, art, magic, skill', most commonly read 'jutsu' and sometimes 'sube' as well], together they mean 'ocular technique/magic'.
Japanese
Jiu Jitsu the Japanese Art of Self-Defense - 1901 I was released on: USA: April 1901
Japanese 'Judo' Commonly Known as Jiu Jitsu - 1913 was released on: USA: 27 November 1913
ju-jitsu
A Brazilian jiu-jitsu gi is an outfit adapted from the jiu-jitsu commonly used in Japanese martial arts. It is composed of a heavy cotton jacket and reinforced trousers.
Yes, Jiu Jitsu as a substitute began in Japan. After, it shifted to the South of the united states through a Japanese diplomat Mitsyuo Maeda to shape the ultramodern Brazilian Jiu- Jitsu. Within the ancient 1900s, it held form with the hand of Maeda.
Tatame, Japanese word (I believe) for the mat they use for grappling.
Your query is vague. If you mean syllable 'i' in Japanese it is い in hiragana and イ in katakana.
Sayounara
ip is not a Japanese word. Japanese words must end with a vowel or the letter N.
Sensei is the Japanese word for a teacher and Sifu is the Japanese word for a grandmaster. While Brazilian Jiu-Jitsu does not come from Japan, it is based on a Japanese martial art called Judo. Any instructors who ask to be called sensei or sifu are likely to have this connection in mind when they tell their students to use these honorifics.
Jiu-Jitsu is roughly translated from Japanese to "the gentle art" in English.