noun
Refers to a public collection box for mail, typically red in Japan. Not used for a private home mailbox (that is 郵便受け).
この手紙をポストに入れてきてください。
Please put this letter in the postbox.
noun
Used for a job, role, or appointed position, similar to English 'post'. Often in formal or organizational contexts.
彼は新しいポストに就任した。
He took up a new post.
noun
post; goalpost
Used in sports for goalposts, uprights, or similar vertical structures. Common in soccer and rugby contexts.
シュートはポストに当たって外れた。
The shot hit the post and went wide.
noun, noun or participle which takes 'suru', transitive verb
post; online post
Refers to a post on a blog, social media, forum, etc. Can be used as a noun or with する to mean 'to post'.
昨日のブログのポストにたくさんコメントがついた。
Yesterday's blog post got a lot of comments.
写真をSNSにポストした。
I posted a photo on social media.
noun-modifying (irregular)
post-
Prenominal prefix meaning 'after' or 'post-', used in compounds like ポスト冷戦 (post-Cold War). Not a standalone noun.
ポストコロナの社会について議論する。
We discuss post-COVID society.