What's the difference between biennial and perennial?

Biennial


Definition:

  • (a.) Happening, or taking place, once in two years; as, a biennial election.
  • (a.) Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.
  • (n.) Something which takes place or appears once in two years; esp. a biennial examination.
  • (n.) A plant which exists or lasts for two years.

Example Sentences:

  • (1) The improved economic status of the aged has been documented by a series of surveys beginning in 1941-42 and carried out from time to time until 1972 and biennially since 1976.
  • (2) In both sexes, at all ages, all-cause, cardiovascular, and coronary mortality rates increased progressively in relation to antecedent heart rates determined biennially.
  • (3) When Philip Roth accepted the biennial International Booker prize honouring some 60 years of his fiction, from Goodbye, Columbus to Nemesis , he sat at a wooden table in the studio adjoining his airy Connecticut retreat looking as much like a retired priest, or judge, as the Grand Old Man of American letters, pushing 79.
  • (4) Cigarette smoking cessation and resumption patterns are presented from biennial examination data from the Framingham Study for the years 1956-1978.
  • (5) My exploded shed was made in 1991, but it wasn't until it was shown at São Paulo Biennial in 1994 that it became well-known."
  • (6) Events such as the Glasgow International and Manchester International are now must-sees, and the Folkestone Biennial looks like following suit.
  • (7) More than one in four myocardial infarctions that occurred over 30 years in the Framingham Study were detected only because of routine biennial electrocardiographic examinations.
  • (8) Assessments are made during routine surveys by field technicians, monthly by the Radiation Safety Officer, and biennially by an independent radiological expert.
  • (9) The obese classification was based on maximum body mass index (BMI) over the 16 available biennial examinations of the Framingham Heart Study.
  • (10) The selection of this population and the success in following it through biennial clinical examinations and indirect surveillance for deaths and hospitalizations are described.
  • (11) Based on 472 stroke events occurring during 10 years' follow-up from biennial examinations 9 and 14, stroke probabilities were computed using the Cox proportional hazards model for each sex based on a point system.
  • (12) The subjects consisted of 143 males and 208 females aged 58-88 years at the 15th biennial examination in 1978.
  • (13) During the tenth biennial examination of the Framingham Study, 1315 participants who were free of cardiovascular disease had fibrinogen levels measured.
  • (14) The festival was co-founded by Erlend Mogård-Larsen and curator Helga-Marie Nordby , who got the idea after working on an art biennial in Lofoten, Norway in 2010.
  • (15) It is the first time the biennial competition has been held in the UK for over 40 years.
  • (16) The hypothesis that obesity-related hypertension is relatively innocuous was explored by an examination of cardiovascular events over 34 years of follow-up when related to biennially measured weights and blood pressures using time-dependent covariate proportional hazards analysis.
  • (17) Perhaps his most significant international contribution was co-founding in 1978, with John Peatling, the International Seminar on Religious Education and Values (Isrev), bringing together international scholars at biennial conferences, initially held alternately in Europe and North America.
  • (18) Barack Obama’s chief of staff, Denis McDonough, took a clipboard and with mayor Ed Lee scoured San Francisco streets last week for the biennial homeless count.
  • (19) In terms of the bienniale itself, I was not so interested in what was happening on Riva degli Schiavoni [where some of the yachts are moored].
  • (20) More young people are joining the dole queue, with the youth unemployment rate increasing from 8.8% in 2008 to 13.3% in 2014, according to the biennial welfare report card from the Australian Institute of Health and Welfare (AIHW).

Perennial


Definition:

  • (a.) ing or continuing through the year; as, perennial fountains.
  • (a.) Continuing without cessation or intermission; perpetual; unceasing; never failing.
  • (a.) Continuing more than two years; as, a perennial steam, or root, or plant.
  • (n.) A perennial plant; a plant which lives or continues more than two years, whether it retains its leaves in winter or not.

Example Sentences:

  • (1) Eighty micrograms of the topically active parasympatholytic drug ipratropium were applied intranasally four times daily in 20 adults with perennial rhinitis and severe watery rhinorrhoea in a double-blind controlled cross-over trial.
  • (2) consider the X-ray findings verified in 3 groups of subjects: with Hayfiber, with perennial rhinitis and the last one being a control group.
  • (3) Eleven children with severe perennial asthma and a poor clinical response to disodium cromoglycate were studied in a 4-month, double blind trial involving 1 month's treatment with placebo, disodium cromoglycate, betamethasone 17 valerate, and both drugs combined according to a predetermined random design.
  • (4) Cruden Farm, Victoria The 54-hectare Murdoch family estate in Langwarrin south of Melbourne, Australia, features magnificent gardens complete with ponds, lemon-scented gum trees and two walled gardens and perennial borders.
  • (5) In this study, the authors evaluate the inhalant substances of the house, emphasizing the importance of Dermatophagoides pteronyssinus to cause perennial allergic rhinitis.
  • (6) A panel of human CD4+ T cell clones specific for the house dust mite was isolated from an atopic individual with perennial rhinitis.
  • (7) Patients who had both perennial symptoms and summer seasonal exacerbations had a higher incidence of a positive family history of atopy and developed symptoms earlier in life than those patients who had summer seasonal or perennial symptoms only.
  • (8) Patients with perennial rhinitis had a more vigorous response than the controls.
  • (9) The immediate changes in regional ventilation and pulmonary blood flow were studied in seventeen adults with perennial asthma and in two control persons, who were challenged by histamine inhalation (histamine induced asthma (HIA)).
  • (10) Twenty-eight patients with allergic perennial rhinitis treated for 2 years with parenteral semidepot immunotherapy were divided into two groups of 14 patients: group A receiving conventional aerosol nebulization (TNE), and group B, which received TNAI using a type F aerosol electrocompressor.
  • (11) We have something to say and something to offer on perennial political dilemmas.
  • (12) Specificity was 87% for pollens and 90% for perennial antigens.
  • (13) Overnight, Russia has moved from perennial rival to trusted friend, while Nato’s future is in peril.
  • (14) More males than females had summer seasonal symptoms whereas more females than males had perennial symptoms.
  • (15) The old-fashioned dining room, unpretentious atmosphere, and the three-course menus under €30 make it a perennial favourite.
  • (16) But Howitt says that while it is a problem that so much farmland has shifted from more adjustable crops to perennials like almonds, he has a simpler solution: better management of groundwater.
  • (17) They are the identification of factors causing severe disease as opposed to heavy infection; the effects of seasonal as opposed to perennial transmission; and the importance of transplacental transmission of microfilariae or soluble antigens.
  • (18) Together with his late wife Janet, he wrote 37 titles including perennial favourites The Jolly Postman and Burglar Bill, and by himself he is the author of many more, including The Pencil, and Woof!
  • (19) It seems that perennial rhinitis probably arises from abundance of domestic antigens more than for the other allergic manifestations, as the nose is the first filter to receive foreign particles.
  • (20) However, PAC differed from SAC in several respects: a history of exacerbation on exposure to house dust (PAC 42 per cent; SAC none) and an association with perennial rhinitis (PAC 75 per cent; SAC 12 per cent) were more common in PAC.