THESAURUS
retention
abnegation, adhesiveness, bullheadedness, camera-eye, cohesiveness, consistency, contradiction, declension, declination, declinature, declining, denial, deprivation, disagreement, disallowance, disclaimer, disclamation, disobedience, dissent, eidetic memory, gluiness, glutinosity, gumminess, holding back, memory span, nay, negation, negative, negative answer, nix, no, nonacceptance, noncompliance, nonconsent, nonobservance, obstinacy, persistence, persistency, photographic memory, recantation, refusal, rejection, repudiation, retentive memory, retentiveness, retentivity, snugness, stick-to-itiveness, stickiness, stubbornness, tackiness, tenaciousness, tenacity, thumbs-down, tightness, total memory, total recall, toughness, turndown, unwillingness, viscidity, viscosity, withholding
ROGET THESAURUS
retention
Possession
N
possession, seizin, seisin, ownership, occupancy, hold, holding, tenure, tenancy, feodality, dependency, villenage, villeinage, socage, chivalry, knight service, exclusive possession, impropriation, monopoly,
retention, prepossession, preoccupancy, nine points of the law, corner, usucaption, future possession, heritage, inheritance, heirship, reversion, fee, seigniority, primogeniture, ultimogeniture, futures contract, warrant, put, call, option, right of first refusal, bird in hand, uti possidetis, chose in possession, possessing, worth, possessed of, seized of, master of, in possession of, usucapient, endowed with, blest with, instinct with, fraught with, laden with, charged with, possessed, on hand, by one, in hand, in store, in stock, in one's hands, in one's grasp, in one's possession, at one's command, at one's disposal, one's own, unsold, unshared, entbehre gern was du nicht hast, meum et tuum, tuum est.
Retention
N
retention, retaining, keep, detention, custody, tenacity, firm hold, grasp, gripe, grip, iron grip, fangs, teeth, claws, talons, nail, unguis, hook, tentacle, tenaculum, bond, clutches, tongs, forceps, pincers, nippers, pliers, vice, paw, hand, finger, wrist, fist, neaf, neif, bird in hand, captive, retaining, retentive, tenacious, unforfeited, undeprived, undisposed, uncommunicated, incommunicable, inalienable, in mortmain, in strict settlement, uti possidetis.
Memory
N
memory, remembrance,
retention, retentiveness, tenacity, veteris vestigia flammae, tablets of the memory, readiness, reminiscence, recognition, recollection, rememoration, recurrence, flashback, retrospect, retrospection, afterthought, post script, PS, suggestion, prompting, hint, reminder, remembrancer, flapper, memorial, commemoration, note, memo, memorandum, things to be remembered, token of remembrance, memento, souvenir, keepsake, relic, memorabilia, art of memory, artificial memory, memoria technica, mnemonics, mnemotechnics, phrenotypics, Mnemosyne, prompt-book, crib sheet, cheat sheet, retentive memory, tenacious memory, photographic memory, green memory, trustworthy memory, capacious memory, faithful memory, correct memory, exact memory, ready memory, prompt memory, accurate recollection, perfect memory, total recall, celebrity, fame, renown, reputation, remembering, remembered, mindful, reminiscential, retained in the memory, pent up in one's memory, fresh, green, green in remembrance, unforgotten, present to the mind, within one's memory, indelible, uppermost in one's thoughts, memorable, by heart, by rote, without book, memoriter, in memory of, in memoriam, memoria in aeterna, suggestive, manet alta mente repostum, forsan et haec olim meminisse juvabit, absens haeres non erit, beatae memoriae, briefly thyself remember, mendacem memorem esse oportet, memory the warder of the brain, parsque est meminisse doloris, to live in hearts we leave behind is not to die, vox audita peril littera scripta manet, out of sight, out of mind.