1.  self-denial(n = noun.attribute) self-discipline - the trait of practicing self discipline;
is a kind of discipline
has particulars: asceticism, austerity, nonindulgence, abstention, abstinence, continence, continency

2.  self-denial(n = noun.act) self-control, self-discipline - the act of denying yourself; controlling your impulses;
is a kind of control
has particulars: abstinence, ascesis, asceticism, mortification

3.  self-denial(n = noun.act) abnegation, denial, self-abnegation, self-renunciation - renunciation of your own interests in favor of the interests of others;
is a kind of forgoing, forswearing, renunciation, self-sacrifice, selflessness

   The denial of one's self; forbearing to gratify one's own desires; self-sacrifice. [1913 Webster]

self-denial, n. = SELF-ABNEGATION.

Idiom:
self-denying ordinance hist. a resolution of the Long Parliament 1645 depriving Members of Parliament of civil and military office.

Derivative:
self-denying adj.

N  worship, adoration, devotion, aspiration, homage, service, humiliation, kneeling, genuflection, prostration, prayer, invocation, supplication, rogation, intercession, orison, holy breathing, petition, collect, litany, Lord's prayer, paternoster, beadroll, latria, dulia, hyperdulia, vigils, revival, cult, anxious meeting, camp meeting, ebenezer, virginal, thanksgiving, giving thanks, returning thanks, grace, praise, glorification, benediction, doxology, hosanna, hallelujah, allelujah, Te Deum, non nobis Domine, nunc dimittis, paean, benschen, Ave Maria, O Salutaris, Sanctus, The Annunciation, Tersanctus, Trisagion, psalm, psalmody, hymn, plain song, chant, chaunt, response, anthem, motet, antiphon, antiphony, oblation, sacrifice, incense, libation, burnt offering, heave offering, votive offering, offertory, discipline, self-discipline, self-examination, self-denial, fasting, divine service, office, duty, exercises, morning prayer, mass, matins, evensong, vespers, undernsong, tierce, holyday, worshipper, congregation, communicant, celebrant, worshipping, devout, devotional, reverent, pure, solemn, fervid, Int, hallelujah, allelujah!, hosanna!, glory be to God!, O Lord!, pray God that!, God grant, God bless, God save, God forbid!, sursum corda, making their lives a prayer, ora et labora, prayers ardent open heaven.

N  disinterestedness, generosity, liberality, liberalism, altruism, benevolence, elevation, loftiness of purpose, exaltation, magnanimity, chivalry, chivalrous spirit, heroism, sublimity, self-denial, self-abnegation, self-sacrifice, self-immolation, self-control, stoicism, devotion, martyrdom, suttee, labor of love, disinterested, unselfish, self-denying, self-sacrificing, self- devoted, generous, handsome, liberal, noble, broad-minded, noble-minded, high-minded, princely, great, high, elevated, lofty, exalted, spirited, stoical, magnanimous, great-hearted, large-hearted, chivalrous, heroic, sublime, unbought, unbribed, uncorrupted, non vobis solum.

N  virtue, virtuousness, morality, moral rectitude, integrity, nobleness, morals, ethics, cardinal virtues, merit, worth, desert, excellence, credit, self-control, self-denial, well-doing, good actions, good behavior, discharge of duty, fulfillment of duty, performance of duty, well-spent life, innocence, virtuous, good, innocent, meritorious, deserving, worthy, desertful, correct, dutiful, duteous, moral, right, righteous, right- minded, well-intentioned, creditable, laudable, commendable, praiseworthy, above all praise, beyond all praise, excellent, admirable, sterling, pure, noble, whole-souled, exemplary, matchless, peerless, saintly, saint-like, heaven-born, angelic, seraphic, godlike, virtuously, adj, e merito, esse quam videri bonus malebat, Schonheit vergeht Tugend besteht, virtue the greatest of all monarchies, virtus laudatur et alget, virtus vincit invidiam.

N  temperance, moderation, sobriety, soberness, forbearance, abnegation, self-denial, self-restraint, self-control, frugality, vegetarianism, teetotalism, total abstinence, abstinence, abstemiousness, Encratism, prohibition, system of Pythagoras, system of Cornaro, Pythagorism, Stoicism, vegetarian, Pythagorean, gymnosophist, teetotaler, abstainer, designated driver, Encratite, fruitarian, hydropot, temperate, moderate, sober, frugal, sparing, abstemious, abstinent, within compass, measured, on the wagon, on the water wagon, dry, Pythagorean, vegetarian, teetotal, appetitus rationi obediant, l'abstenir pour jouir c'est l'epicurisme de la rai, trahit sua quemque voluptas.