1.  desertion(n = noun.act) abandonment, defection - withdrawing support or help despite allegiance or responsibility; "his abandonment of his wife and children left them penniless"
is a kind of withdrawal
has particulars: abscondment, decampment, absence without leave, unauthorized absence, deviationism
Derived form verb desert₁

2.  desertion(n = noun.act) abandonment, forsaking - the act of giving something up;
is a kind of rejection
has particulars: exposure, apostasy, tergiversation, bolt
Derived form verb desert₂

N  relinquishment, abandonment, desertion, defection, secession, withdrawal, cave of Adullam, nolle prosequi, discontinuance, renunciation, abrogation, resignation, desuetude, cession, unpursued, relinquished, relinquishing, Int, avast!, aufgeschoben ist nicht aufgehoben, entbehre gern was du nicht hast, relinquishment, abandonment, renunciation, expropriation, dereliction, cession, surrender, dispensation, quitclaim deed, resignation, riddance, derelict, foundling, jetsam, waif, discards, culls, rejects, garbage, refuse, rubbish, relinquished, cast off, derelict, unowned, unappropriated, unculled, left, Int, away with!.

N  exclusion, nonadmission, omission, exception, rejection, repudiation, exile, noninclusion, preclusion, prohibition, separation, segregation, seposition, elimination, expulsion, cofferdam, excluding, exclusive, excluded, unrecounted, not included in, inadmissible, exclusive of, barring, except, with the exception of, save, bating, exclusion, seclusion, exclusion, seclusion, privacy, retirement, reclusion, recess, snugness, delitescence, rustication, rus in urbe, solitude, solitariness, isolation, loneliness, estrangement from the world, voluntary exile, aloofness, cell, hermitage, convent, sanctum sanctorum, depopulation, desertion, desolation, wilderness, howling wilderness, rotten borough, Old Sarum, exclusion, excommunication, banishment, exile, ostracism, proscription, cut, cut direct, dead cut, inhospitality, inhospitableness, dissociability, domesticity, Darby and Joan, recluse, hermit, eremite, cenobite, anchoret, anchorite, Simon Stylites, troglodyte, Timon of Athens, Santon, solitaire, ruralist, disciple of Zimmermann, closet cynic, Diogenes, outcast, Pariah, castaway, pilgarlic, wastrel, foundling, wilding, secluded, sequestered, retired, delitescent, private, bye, out of the world, out of the way, the world forgetting by the world forgot, snug, domestic, stay-at-home, unsociable, unsocial, dissocial, inhospitable, cynical, inconversable, unclubbable, sauvage, troglodytic, solitary, lonely, lonesome, isolated, single, estranged, unfrequented, uninhabitable, uninhabited, tenantless, abandoned, deserted, deserted in one's utmost need, unfriended, kithless, friendless, homeless, lorn, forlorn, desolate, unvisited, unintroduced, uninvited, unwelcome, under a cloud, left to shift for oneself, derelict, outcast, banished, noli me tangere, among them but not of them, and homeless near a thousand homes I stood, far from the madding crowd's ignoble strife, makes a solitude and calls it peace, magna civitas magna solitudo, never less alone than when alone, O sacred solitude! divine retreat!.