'posting' (hence 'postings') originates from English, formed from the verb 'post' + the suffix '-ing'. The verb 'post' entered English via Middle English and Old French (e.g. 'poste'/'post') from Medieval Latin 'posta' (a placed station), ultimately from Latin root related to 'ponere' meaning 'to place'.

'post' in Middle English appeared as 'poste' (from Old French 'poste'/'post'), meaning a station or relay for couriers; the verb 'to post' (to send or to put up publicly) developed from these senses, and the noun/gerund 'posting' developed as the -ing form and later came to be used as a noun meaning a notice, message, bookkeeping entry, or assignment.

Initially related to a 'place' or 'station' (a location for mail/relay), the sense broadened to 'send by post', 'place publicly', or 'assign someone to a post'; over time it evolved into modern senses such as an announcement (job posting), an online message (forum/social media), and an accounting entry.