It's a well established term. Example, this article of James Lewis and Martin Fowler from 10 years ago https://martinfowler.com/articles/microservices.html http

It's a well established term. Example, this article of James Lewis and Martin Fowler from 10 years ago https://martinfowler.com/articles/microservices.html https://martinfowler.com/articles/microservices.html "To start explaining the microservice style it's useful to compare it to the monolithic style: a monolithic application built as a single unit. Enterprise Applications are often built in three main parts: a client-side user interface (consisting of HTML pages and javascript running in a browser on the user's machine) a database (consisting of many tables inserted into a common, and usually relational, database management system), and a server-side application. The server-side application will handle HTTP requests, execute domain logic, retrieve and update data from the database, and select and populate HTML views to be sent to the browser. This server-side application is a monolith - a single logical executable[2]. Any changes to the system involve building and deploying a new version of the server-side application."