The word "commencement" can be shortened to "comm." This abbreviation is commonly used in contexts such as academic ceremonies, where "comm." may refer to commencement exercises. However, it's important to ensure that the abbreviation is clear to the audience to avoid confusion.
At the commencement of the meeting, everybody did not expect it to last long.
commence...
I had to shorten my presentation to fit within the time limit.
jnr
lengthen
The graduation ceremony is sometimes called "Commencement" because the ceremony marks the beginning, or commencement, of life outside the academic environment.
when you need to shorten the word Incorporated
Commencement or start. opening, birth, origin, outset, onset, initation, inauguration
In some cases called a commencement
Shorten
At least when relating to computers/music files, it's .shn for Shorten format.
There is no indication that it is common for people to shorten the word therapy into 'therap'. It is still known by the word therapy and will probably stay that way.