1.  avulsion(n = noun.event) Array - an abrupt change in the course of a stream that forms the boundary between two parcels of land resulting in the loss of part of the land of one landowner and a consequent increase in the land of another; Array
is a kind of alteration, change, modification

2.  avulsion(n = noun.act) Array - a forcible tearing or surgical separation of one body part from another; Array
is a kind of separation
Derived form verb avulse₁

1.  A tearing asunder; a forcible separation. [1913 Webster]
"The avulsion of two polished superficies." [1913 Webster]

2.  A fragment torn off. J. Barlow. [1913 Webster]

3.  The sudden removal of lands or soil from the estate of one man to that of another by an inundation or a current, or by a sudden change in the course of a river by which a part of the estate of one man is cut off and joined to the estate of another. The property in the part thus separated, or cut off, continues in the original owner. Wharton. Burrill. [1913 Webster]

avulsion, n.
1 a tearing away.
2 Law a sudden removal of land by a flood etc. to another person's estate.

Etymology:
F avulsion or L avulsio f. avellere avuls- pluck away

N  disjunction, disconnection, disunity, disunion, disassociation, disengagement, discontinuity, abjunction, cataclasm, inconnection, abstraction, abstractedness, isolation, insularity, insulation, oasis, island, separateness, severalty, disjecta membra, dispersion, apportionment, separation, parting, circumcision, detachment, segregation, divorce, sejunction, seposition, diduction, diremption, discerption, elision, caesura, break, fracture, division, subdivision, rupture, compartition, dismemberment, dislocation, luxation, severance, disseverance, scission, rescission, abscission, laceration, dilaceration, disruption, abruption, avulsion, divulsion, section, resection, cleavage, fission, partibility, separability, fissure, breach, rent, split, rift, crack, slit, incision, dissection anatomy, decomposition, cutting instrument, buzzsaw, circular saw, rip saw, separatist, disjoined, discontinuous, multipartite, abstract, disjunctive, secant, isolated, insular, separate, disparate, discrete, apart, asunder, far between, loose, free, unattached, unannexed, unassociated, unconnected, distinct, adrift, straggling, rift, reft, scissile, divisible, discerptible, partible, separable, separately, one by one, severally, apart, adrift, asunder, in twain, in the abstract, abstractedly.

N  extraction, extracting, removal, elimination, extrication, eradication, evolution, evulsion, avulsion, wrench, expression, squeezing, extirpation, extermination, ejection, export, extractor, corkscrew, forceps, pliers, extracted.