Washington DC: If you are an ardent user of terms like 'sesh', 'vacay', or even 'tallboy', you are now free to express yourself even better as these are among the 530 words that have made it to the Merriam-Webster dictionary.

Together with these, the editors of the dictionary have added over 530 words in this month with 4000 new definitions, etymology and pronunciation revision, reported Fox News. Wondering what these new terms are?

These new additions range from "serious to the playful, from the technical to the informal," according to the website, as it has added words from pop culture, politics, sports, psychology and more.

Amongst those 530 is 'fatberg' which refers to a large mass of fat and solid waste that collects in a sewer system.

'Deep State', means an alleged secret network of non selected government officials and sometimes private entities.

A portmanteau of a solo entrepreneur, 'solopreneur' has also been added to the popular dictionary.

For those who wish to define their abnormal fear of clowns, can make use of the term 'caulrophobia'.

'Dad Joke' described as a wholesome (and typically corny) joke with an obvious punchline is another one amongst the inclusions.

Just as words have been added, some definitions have been modified too.

For example, the term 'they' has been updated to be recognised as a pronoun with an added meaning: "Used to refer to a single person whose gender identity is nonbinary".

'Haircut' has also got a new business meaning, referring now to a "reduction in the value of an asset".

Back in April, the dictionary added more than 640 new words like 'snowflake', 'garbage time', 'on-brand' and 'gender nonconforming', among others.