Correct spelling, explanation: the etymology of the word discussion originates from the Latin word discussio, which means examination or investigation. In English, it has been used since the 14th century with similar meanings related to examining or considering something thoroughly. Both discussion about and discussion on stem from this root word and have evolved through common usage in English. There isn’t a distinct difference in the etymology between discussion about and discussion on. Both phrases evolved naturally in English to convey the act of conversing or deliberating on a topic or subject. They may have slightly different nuances in contemporary usage, as explained earlier, but their etymological roots are quite similar.

Definition of discussion about:
Phrase, the activity in which people talk about something and tell each other their ideas or opinions
Our team had a productive discussion about potential marketing strategies for the upcoming product launch.
The community held a town hall meeting to facilitate a discussion about the proposed changes to local zoning regulations.

Collocations with discussion about:
Some of the most commonly used collocations include:
1. Serious discussion about: implies a deep or earnest conversation about a particular subject.
There needs to be a serious discussion about the environmental impact of our actions.
2. Lengthy discussion about: suggests that the conversation was prolonged or extensive in duration.
The meeting lasted for hours due to the lengthy discussion about budget allocations.
3. Open discussion about: indicates a conversation where all participants are encouraged to freely express their opinions and ideas.
We encourage open discussion about diversity and inclusion in our workplace.
4. Meaningful discussion about: implies that the conversation was significant or had a profound impact on the participants.
The family had a meaningful discussion about their values and priorities.

Correct spelling, explanation: both discussion on and discussion about are correct phrases. The first phrase typically implies focusing on a specific aspect, topic, or subject within a broader context. It suggests that the conversation is centered around exploring different perspectives, arguments, or points related to that particular aspect. The second phrase is more general and encompasses a broader range of topics or subjects. It implies a conversation or exchange of ideas regarding a particular topic without necessarily specifying any particular aspect. While discussion on and discussion about can sometimes be used interchangeably, using the most appropriate phrase can help to convey the intended meaning more clearly.