What's the difference between once and seldom?

Once


Definition:

  • (adv.) By limitation to the number one; for one time; not twice nor any number of times more than one.
  • (adv.) At some one period of time; -- used indefinitely.
  • (adv.) At any one time; -- often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.

Example Sentences:

Seldom


Definition:

  • (a.) Rare; infrequent.

Example Sentences:

  • (1) This scintigraphic localization of osteomyelitis seldom has been reported.
  • (2) Women seldom occupy higher positions in a [criminal] organisation, and are rather used for menial, but often dangerous tasks ,” it notes.
  • (3) Survival and healing of "extremely severe" grade intoxication can only be obtained through a surgical intervention within the first hours; a laparotomy will indicate the depth of the lesions, which is not determined by endoscopy, and will consist of Celerier's stripping method and if necessary a gastrectomy, more seldom a cephalic duodeno-pancreatectomy.
  • (4) Sensitivity and specificity were enhanced when we linked multiple predictors, but this linkage was seldom successful because few patients had more than one positive predictor.
  • (5) Data from cases with myocardial bridges show that both fatty streaks and raised lesions are seldom observed in the region distal to myocardial bridge.
  • (6) This suggests that common food additives are seldom if ever of significance as precipitating factors in chronic urticaria or atopic dermatitis.
  • (7) The pronostic is related to the risk seldom degenerate.
  • (8) Cavernous hemangiomas of the brain stem are usually discovered accidentally during evacuation of a hematoma, and successful surgical treatment of these lesions is seldom achieved.
  • (9) Older animals seldom have a single disease, but rather each one represents a unique combination of varying levels of loss of function at both the cellular and systems level.
  • (10) More specifically, disfigurement seldom was mentioned as a reason for not returning to work and for not participating in social activities with work mates, friends, relatives, and society in general.
  • (11) Partial scrotal loss is seldom a problem, as local flaps and closure of the defect with the remaining scrotal skin can usually be accomplished.
  • (12) In the WikiLeaks cables, the US ambassador in Berlin characterised the chancellor as "risk-averse and seldom creative".
  • (13) It was demonstrated that administrative and ward work constituted the greater part of the activities studied, contact on the other hand being only seldom observed.
  • (14) This event is seldom; only 38 cases of true spontaneous rupture of the spleen in infectious mononucleosis could be found when the literature was reviewed.
  • (15) The neurotologic evaluation is negative and attempts to establish an etiology are seldom fruitful.
  • (16) Although a large population can be healthy for the economy, this seldom seems to be the case in developing countries because of the restricted availability of resources.
  • (17) The main advantage of this classification is that it can be used even in places where postmortems are seldom performed.
  • (18) Because cavernous malformations are often angiographically occult and do not have a characteristic appearance on computed tomography (CT), they are seldom recognized preoperatively and may be missed if the surgical specimen is not carefully reviewed.
  • (19) Although psychiatric symptoms are common among elderly individuals, these symptoms are seldom treated by psychotherapy.
  • (20) Hemangiopericytoma seldom originates from the lung.