a mixed script of kanji and katakana, or a use of such script, that was common in formal writing, before modern orthographic reforms which favored hiragana over katakana for grammatical elements such as particles and inflectional affixes

Katakana, a set of Japanese syllabary characters, secondary to hiragana, derived from portions of Chinese characters whose sounds approximate the Japanese sound being represented. Chiefly thought of as being used for loanwords (cf. カタカナ語 (“loanword”, literally “katakana word”)), it has a number of other uses too, complementing hiragana; see Katakana#Usage on Wikipedia.Wikipedia

(grammar) a sentence / writing / an essay or composition / a writing style

a male given name

write; record (words, figures) on the surface of (something) / compose; put (an idea, etc) into words

conjunctive form of 書く

(elementary mathematics) word problem

stroke order

Alternative form of 書き留める

truth, reality