Some common examples of oxymoron expressions are "alone together," "virtual reality," and "a fine mess."

Should the sentence read:

oxymoronic, oxymora or oxymorons

Answer: oxymoronic

Right.

To determine which term to use, we need to consider the basic rules of English grammar. An oxymoron is a figure of speech that combines contradictory terms or ideas, creating a paradoxical or self-contradictory effect. In this case, we are looking for the appropriate term to describe the examples given.

The term "oxymoron" refers to a single instance or example of this figure of speech. So, if we are discussing one specific example, we could say "This expression is an oxymoron."

However, the question asks for the term that describes these examples in general. The proper term to use in this case is "oxymoronic." This term functions as an adjective to describe a group of oxymorons or the characteristic of having or relating to oxymorons.

Therefore, the sentence should read: "Some common examples of oxymoronic expressions are 'alone together,' 'virtual reality,' and 'a fine mess.'"