Irrefragable (pronounced ih-ref-ruh-guh-buhl)
(1) Not to be disputed or contested (as assertion).
(2) Not able to be denied or refuted; indisputable (as
fact).
(3) That which cannot or should not be broken;
indestructible (archaic and probably extinct).
(4) Of a person, someone obstinate; stubborn (obsolete except
as a literary device).
1525–1535: A learned borrowing from Late Latin irrefrāgābilis (irrefragable) with the English suffix –able appended. The suffix -able was from the Middle English -able, from the Old French -able, from the Latin -ābilis (capable or worthy of being acted upon), from the primitive Indo-European i-stem forms -dahli- or -dahlom (instrumental suffix); it was used to create adjectives with the sense of “able or fit to be done”. The construct of irrefrāgābilis was the Latin ir- (a variant of in- (used a prefix meaning “not”)) + refragā(rī) (the present active infinitive of refrāgor (to oppose, resist; to gainsay, thwart)) + -bilis (the suffix used to form adjectives indicating a capacity or worth of being acted upon). Because of the paucity of documentary evidence, the ultimate source of the Latin refrāgor remains uncertain, but the construct may have been re- (the prefix used in the sense of “again”) + fragor (a breaking, shattering; a crash; din, uproar (from frangō (to break, shatter), ultimately from the primitive Indo-European bhreg- (to break)), formed as an antonym of suffrāgōr, the first-person singular present passive indicative of suffrāgō (to support; to vote for). The sixteenth century French form was irréfragable, also from the Late Latin. The meanings related to “indestructible objects” fell from use as early as the mid-seventeenth century while the figurative sense of “someone stubborn or obstinate” endured into the twentieth and, as a literary device, probably still tempts some and for those so tempted, the better style guides help by telling us to stress the second syllable. The spelling irrefragible is obsolete. Irrefragable is an adjective, irrefragability & irrefragableness are nouns and irrefragably is an adverb; the noun plural is irrefragabilies.
In English, irrefragable didn’t survive in common use for no better reason than people for whatever reason preferred the alternatives (literal & figurative) including (depending on the context): undeniable, indubitable, unassailable, indisputable, unambiguous, unquestionable, irrefutable, incontestable, immutable and unanswerable. All those synonyms convey much the same thing for most so usually, the only thing the use of “irrefragable” is likely to engender is bafflement; few people will know what it means. That can be fun between consenting word-nerds but it otherwise tends just to annoy. There are structuralists who claim “irrefragable” is (or at least can be) different form a word like “unquestionable” because the former should specifically be associated with logical or argumentative strength while the later can be used in any context without necessarily emphasizing the same rigorous logical support. So, because the underpinning of the scientific method is the disproving stuff, to say a scientific theory is irrefragable does not mean it cannot be argued against or disproven or that it’s beyond doubt or uncertainty; it means only that it cannot be refuted based on the current evidence. By contrast, in some schools of theology, many things are unquestionable, not because they can be proved or disproven but because they must be accepted as matters of faith. In the Roman Catholic Church, this is formalized: If a pope (invoking his infallibility in matters of dogma), declares something to be thus, it is, as a matter of canon law, both irrefragable & unquestionable. The ancient idea of papal infallibility has been invoked only once since it was codified in the proceedings of the First Vatican Council (Vatican I 1869-1870) but since the early post-war years, pontiffs have found ways to achieve the same effect, John Paul II (1920–2005; pope 1978-2005) & Benedict XVI (1927–2022; pope 2005-2013, pope emeritus 2013-2022) both adept at using what was in effect a personal decree a power available to one who sits at the apex of what is in constitutional terms an absolute theocracy. Critics have called this phenononom "creeping infallibility" and its intellectual underpinnings own much to the tireless efforts of Benedict XVI while he was head of the Inquisition (by then called the Congregation for the Doctrine of the Faith) during the late twentieth century.
Defragable: Defragmentation in action under MS-DOS 6.22. On a nearly full big drive (say 320 MB) on which defragmentation had been neglected for a while, the process could take literally hours. True obsessives would add the relevant command to their autoexec.bat to start every day with a defrag, the sequence being: (1) switch on, (2) go and get coffee and (3) hope it was done upon return.
Before installable file systems (IFS) began to gain critical mass in the 1990s, disk defragmenters were something of a fetish among nerds because, at the software level, there were few quicker (a relative term) and cheaper ways to make things run faster. Fragment was from the late Middle English fragment, from the Latin fragmentum (a fragment, a remnant), the construct being frangō (I break) + -mentum, from the suffix -menta (familiar in collective nouns like armenta (herd, flock)), from the primitive Indo-European -mn̥the. The tendency of the early file systems to increasing sluggishness was because the File Allocation Table (FAT) was an up-scaled variant of that used on floppy diskettes where the cluster sizes (the segments into which the media was divided) were small and thus less prone to fragmentation. However, because of the arcane math which dictated how many clusters there could be under the various implementations of FAT, the only way to accommodate the increasing size of hard disk drives (HDD) was to make the clusters larger, the consequence of which was a file of 1 KB or less absorbed all of a 32 KB cluster, something both an inefficient use of space and inherently prone to fragmentation. What defragmenters did was re-allocate files to make data both as contiguous and un-fragmented as possible. Modern file systems (HPFS, NTFS et al) still have limits but the numbers are very big and contemporary operating systems now handle defragmentation dynamically. Although it remains a useful system on USB pen drives and such because of the wide system compatibility and ease of use, it’s doubtful even the more nostalgic nerds have fond memories of FAT on HDDs; a corrupted FAT could be a nightmare.