敬二, 桂司, 敬司, 慶二, 敬治, 啓史, 啓司, 啓次: a male given name / 啓治, 圭司, 恵二, 恵治, 桂二, 敬次, 恵司, 啓二: a male given name / 圭二: a male given name

内形: internal dimensions / 内径: inside diameter

模型: plastic hobby model

(computing) computational linguistics

researcher

a research student (i.e. a visiting or non-matriculating graduate student) / a researcher

research & development; R&D

research association; research society / group of enthusiasts (as may be found in schools, colleges, etc)

researcher

(education) research project, done by Japanese schoolchildren during summer break, to be presented upon return to school