The Urantia Book contains only a few problematic independent adjectives, e.g., absonite, midsonite, and agondant. Especially, "absonite" and its derivatives (absonitize, absonity, etc.) are used 84 times.
Even if this is true, "absonite" does not mean "absolute and finite," nor does it mean "absolute or finite." One might as well have chosen "fisolute" or "filute" by combining "fi-" in "finite" and "-solute" or "-lute" in "absolute," but such words do not exist.
Moreover, it is clear that "absonite" and "midsonite" belong to the same category, and it is obvious that "midsonite" is split into "mid-"and "-sonite." Specifically,
The point here is that we cannot be absolutely sure about the right dichotomy, nor can we detect the intention of the Orvonton Divine Counselor. However, it appears that he or the associated personalities wanted the new coined word sound like an English word so that it mixes smoothly with other English words in the Book.
Regardless of how the word is split, "absonite" was intended to describe the stage or level between the finite and the absolute:
"Having thus found God as the Father of all creatures, these finaliters must sometime begin the quest for the superfinite Father. But this quest involves a grasp of the absonite nature of the ultimate attributes and character of the Paradise Father. Eternity will disclose whether such an attainment is possible, but we are convinced, even if the finaliters do grasp this ultimate of divinity, they will probably be unable to attain the superultimate levels of absolute Deity. (p.116, §8)
"Many superfinite activities take place in the Havona of the present universe age, involving untold diversities of absonite and other phases of mind and spirit functions." (p.160, §6)
"Havona will unquestionably continue to function with absonite significance even in future universe ages which may witness space pilgrims attempting to find God on superfinite levels." (p.163, §3)
Thus, "absonite" is a superfinite, but subasolute state. If finaliters grasp the absoniteness of the ultimate nature of our Father, (they reach the ultimate level, but) they do not reach the superultimate or absolute level of the absolute Deity.
The real clue to "absonite" appears in its definition:
So "absonite" literally means "without beginnings or endings and by the transcendence of time and space."
Note, however, any non-Deity beings in time and space have either a beginning or an ending. Hence transcendence of time and space means having no beginning or ending in time and space. Moreover, "whenever time and space are transcended," it is an absonite phenomenon. In other words, "absonite" is "time-space transcendent." "When man chooses to find God and to be like him, such a choice is superfinite; only eternity can disclose whether this choice is also superabsonite." (p. 1300, §3)
Another way of stating the latter sentence is: "Whether eternity can disclose whether this choice transcends the superfinite (i.e., absonite) level."
Time and space are devices by which creatures are enabled to coexist with the Infinite (p. 1303, §2) Any creature limited by time and space are finite. Conversely, every finite thing or being is limited by time and space. Thus, transcending time and space also means "transfinite" or "superfinite."
Both "superfinite" and "transfinite" are mathematical terms. I guess the Revelators did not want mathematical connotation. Also, these terms refer to a notion that transcends finite space or quantity. They are not qualitative terms. As a consequence, we do not have words for entities that transcend space but time-limited, or time-transcendent but space-limited. These entities are to a certain extent, as laymen understand them, transcend finiteness in a limited way. However, unless both time and space are transcended, they cannot be called "absonite."
The suffix "-er" is often used with a verb to describe a person engaged in that activity, as in "player." Thus, "agondont" might be a verb.
However, no English verb has an ending "-dont." The suffix is also used to describe the comparative degree of adjectives, as in "finer." However, it is also used to describe a person associated with the adjective, as in "foreigner," "goner," "westerner," "down-and-outer," and "absoniter," although this usage is much rarer than others.
Thus, an agondonter is a person who is agondont. The Urantia Book clearly defines the meaning of "agondont":
"Agondont" exactly means being "able to believe without seeing, persevere when isolated, and triumph over insuperable difficulties even when alone." Because it is too long, the latter long phrase cannot be in the place of "agondont" in any language. Another way to define "agondant" is "persevering under all conditions," and hence agondonter can be defined as "absolute perseverer."