Another point to remember when defining terms is who the source is: AWS, API, ASME, etc. There are many terms that differ between D1.1 and API 1104. They differ either/or in formal definition and then as to application.
So, when trying to define any terms I always start with A3.0 but then take the job into consideration to see if I need to be looking up another organization's glossary.
I say that because I already see two different perspectives here, at least I believe I do. Al is looking at your request from a structural application with D1.1 & A3.0 being the go to sources. Shane was commenting from a pipe welding perspective and thus taking pipe applications and definitions into account.
From your OP, I'm not sure we can precisely answer your query as we don't know the specifics of your job.
Have a Great Day, Brent