join in a group or effort, participate, take part in / increase / be added to

pupil, educatee, student (especially in junior high schools (中学校) or high schools (高校) in Japan)

(software engineering) class diagram - A type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, and the relationships between the classes.

new, novel / latest, recent / modern / fresh

(archaic) new, novel / (archaic) latest, recent / (archaic) modern / (archaic) fresh

(obsolete) Same as あたらし (atarashi) above

(obsolete) Alternative spelling of 新たし (aratashi): new, novel

(education) class (group of students in a regularly scheduled meeting with a teacher) / class of things (typically products) sharing certain features / (programming, object-oriented programming) class

mouth

(chiefly women's speech) first person singular pronoun: I, me