preposition
Grammatical term for a word that shows the relationship between a noun and another word, such as 'in', 'on', or 'at' in English. Often contrasted with 後置詞 (postposition).
See also: 後置詞
English 'in' and 'on' are prepositions.
If you misuse prepositions, the meaning may not get across.
Compound of 前 (before) + 置 (place) + 詞 (word), literally 'before-placed word', a calque from Western grammatical terminology.