Definition - What does ECMAScript mean?
Techopedia explains ECMAScript
The European Computer Manufacturers Association developed the official standard for ECMAScript, often known as ECMA-262. The ECMA standard helps in defining the ECMAScript language and also ensures the consistency between web script implementations. Eight editions of ECMAScript have been published, with the first edition published in 1997. JScript and ActionScript also make use of ECMAScript. ECMAScript achieved much popularity and rise in adoption after the publication of the third edition.