sublunary
The term "sublunary" means situated below the moon or of this world. In the context of the poem, it suggests that the narrator's love is earthly and not transcendent or divine. The love is limited by the realities and imperfections of the world.
That they can only be in love when they are physically together best summarizes the oppositions in the fourth and fifth stanza of A Valediction Forbidden Mourning between the narrator's love and that of sublunary lovers.
Sublunary Tragedies was created in 1999.
Did you mean "A Valediction: forbidding mourning" by John Donne? The word choice emphasizes the difference between the speaker's love and "dull sublunary lovers love." One instance of very deliberate word choice may be found in lines 7-8: "T'were prophanation of our joyes/To tell the layetie our love." Profanation and laity are both words with religious meanings, and their use gives the reader the idea that the love is holy.
Dull is lacking interest and excitement. Sublunary is of the world. Dull, sublunary lovers' love is worldly love that lacks interest and excitement.
refinement
"Sublunary" means "under the moon". I suppose the idea is that moonlight helps to make an atmosphere of love.
"Dull sublunary lovers" refers to lovers whose passion is mundane or lacking in intensity. The term "sublunary" refers to things on Earth or in the material world, suggesting that these lovers are focused on the physical aspects of love rather than deeper emotional connections.
Dull; Refined
The sublunary lovers' love is more refined; he calls it "dull."
The literal meaning of the word "sublunary" is "below the moon" or "existing beneath the moon." It is often used to refer to things that are earthly or worldly in nature, as opposed to those that are celestial or spiritual.
This quote from John Donne's poem "The Good Morrow" suggests that lovers who are only focused on physical sensations cannot endure being apart from each other because it takes away the physical pleasures that unite them. It emphasizes the shallow nature of a relationship based solely on physical attraction.