1.  one by one(r = adv.all) one after another, one at a time - in single file; "the prisoners came out one by one"

2.  one by one(r = adv.all) by the piece - one piece at a time; "she sold the plates by the piece"

3.  one by one(r = adv.all) individually, on an individual basis, separately, severally, singly - apart from others; "taken individually, the rooms were, in fact, square"; "the fine points are treated singly"

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  speciality, specialite, individuality, individuity, particularity, peculiarity, idiocrasy, personality, characteristic, mannerism, idiosyncrasy, specificness, singularity, reading, version, lection, state, trait, distinctive feature, technicality, differentia, particulars, details, items, counts, minutiae, I, self, I myself, myself, himself, herself, itself, special, particular, individual, specific, proper, personal, original, private, respective, definite, determinate, especial, certain, esoteric, endemic, partial, party, peculiar, appropriate, several, characteristic, diagnostic, exclusive, singular, idiomatic, idiotypical, typical, this, that, yon, yonder, specially, especially, particularly, in particular, in propria persona, ad hominem, for my part, each, apiece, one by one, one at a time, severally, respectively, each to each, seriatim, in detail, in great detail, in excruciating detail, in mind-numbing detail, bit by bit, pro hac vice, pro re nata, namely, that is to say, for example, id est, exemplia gratia, e, g, i, e, videlicet, viz, to wit, le style est l'homme meme.

N  unity, oneness, individuality, solitude, isolation, unification, one, unit, ace, individual, none else, no other, one, sole, single, solitary, unitary, individual, apart, alone, kithless, unaccompanied, unattended, solus, single-handed, singular, odd, unique, unrepeated, azygous, first and last, isolated, insular, monospermous, unific, uniflorous, unifoliate, unigenital, uniliteral, unijocular, unimodal, unimodular, lone, lonely, lonesome, desolate, dreary, insecable, inseverable, indiscerptible, compact, indivisible, atomic, irresolvable, singly, alone, by itself, per se, only, apart, in the singular number, in the abstract, one by one, one at a time, simply, one and a half, sesqui-, natura il fece, e poi roppe la stampa, du fort au faible, two souls with but a single thought, two hearts that beat as one.

as one, at one, at one time, beneath one, beyond one, fast one, for each one, for one, for one thing, from each one, go one better, hundred and one, in one case, in one ear, loved one, naked as the day one was born, number one, number one wood, on one hand, on the one hand, one, one after another, one and all, one and only, one at a time, one c, one dollar bill, one horse, one hundred, one hundred eighty, one hundred fifteen, one hundred fifty, one hundred fifty-five, one hundred five, one hundred forty, one hundred forty-five, one hundred ninety, one hundred one, one hundred seventy, one hundred seventy-five, one hundred sixty, one hundred sixty-five, one hundred ten, one hundred thirty, one hundred thirty-five, one hundred twenty, one hundred twenty-five, one iron, one million million, one million million million, one of the boys, one of these days, one one's coattails, one percent, one piece, one shot, one sided, one thousand, one thousand million, one thousand thousand, one time, one upmanship, pull a fast one, pull a fast one on, put one across, put one over, rolled into one, six of one and half a dozen of, square one, thousand and one nights, to each one, to one ear, young one