Definition of stratify in English:

stratify

verb

[WITH OBJECT]
  • 1 Form or arrange into strata.

    ‘socially stratified cities’
    [no object] ‘the residues have begun to stratify’
    • ‘The major cultural and ethnic groups are characterized by a marked degree of specialization in labor that derives from their complex precolonial hierarchical, stratified social organization.’
    • ‘The system was stratified, but social mobility was possible.’
    • ‘Within the socially stratified Graeco-Roman world the exchange of services were never voluntary, but always reciprocal.’
    • ‘Published data from a lake and diurnally stratified river weir pool are used here to verify a minimum thermocline depth hypothesis proposed by others.’
    • ‘The origin of ironstone can be thought of as a layer-by-layer replacement process of primarily stratified rocks that were subjected to shearing.’
    • ‘In northern Portugal, nicknames are extremely important as terms of reference that connote moral equivalence in otherwise socially stratified rural communities.’
    • ‘Even in socially stratified Britain, where he has always been able to hold a conversation with anyone so long as it is about fishing, shooting or gun dogs, he is accepted.’
    • ‘The continental crust is not stratified like the oceanic crust and so does not have a characteristic seismic velocity structure.’
    • ‘This switch can, in part, be accounted for by the marked fall in sea level noted above, whereby normally stratified conditions are likely to become more indistinct.’
    • ‘Turbulence within the thermocline of two thermally stratified lakes - Lake Biwa, Japan, and Lake Kinneret, Israel - was investigated using a portable flux profiler.’
    • ‘Many Cameroonians have a highly stratified social structure.’
    • ‘Some andesitic and felsic intrusions created a minor, stratified volcaniclastic component via hydrovolcanic eruptions.’
    • ‘The US is, finally, among the most socially stratified countries in the world.’
    • ‘The predictor lakes were Trout Lake, a strongly stratified lake, and Allequash, a poorly stratified lake.’
    • ‘This contrasts with the lithological association recognized in the main parts of the Moine succession in which stratified calcareous rocks are absent.’
    • ‘This supports the interpretation of Erba and Herrle that the abundance pattern of the nannoconids follows changes between phases of more stratified surface waters and those of enhanced mixing.’
    • ‘This field experiment was conducted in a deep, stratified lake that typically displays coexistence of multiple Daphnia species.’
    • ‘The Copper Harbor Conglomerate consists of crudely stratified pebble-to-boulder conglomerate with thin beds of sandstone.’
    • ‘The measured succession crops out continuously and is well stratified.’
    • ‘The correlation between the rigid, socially stratified school system in Germany and the tragedy of Erfurt was striking.’
    1. 1.1Arrange or classify.
      ‘stratifying patients into well-defined risk groups’
      • ‘In addition, patients were stratified on the basis of severity of illness and age.’
      • ‘To optimise treatment, patients should be stratified into risk categories to allow the most appropriate prophylactic measure to be used.’
      • ‘They stratified patients into five risk classes according to 20 clinical and laboratory variables, and found a clear correlation between mortality and risk class.’
      • ‘The International Obesity Task Force has stratified patients into different classes of obesity.’
      • ‘Subsequent analyses were stratified by gender.’
      • ‘With this index, patients are stratified into three risk categories based on their total points.’
      • ‘We stratified patients by age and sex and calculated rates for all observations.’
      • ‘Urbanization encouraged commercialized leisure, stratified by social class and varying among different immigrant groups.’
      • ‘We stratified patients in each centre according to degree of obstruction and randomised them to treatment by consecutive sealed opaque envelopes.’
      • ‘Patients were then stratified into cost deciles.’
      • ‘After a three month dietary run-in period patients were stratified on the basis of fasting plasma glucose concentration and body weight.’
      • ‘Patients were stratified by their eligibility for standard anticoagulation and then randomly assigned to one of three treatment groups.’
      • ‘In a society stratified by economic classes, economic slavery will continue to exist even if the conditions for its abolition are possible.’
      • ‘Patients were stratified according to the number of predictive factors present and divided into three risk categories (low, moderate, and high).’
      • ‘Patients were stratified into three groups on the basis of the likelihood of bacteremia.’
      • ‘For randomisation, patients were stratified according to hospital and treatment intent.’
      • ‘The Osserman scale is a common classification scheme used to stratify patients with myasthenia gravis.’
      • ‘Researchers stratified patients undergoing urologic surgery by invasiveness of the procedure and degree of contamination.’
      • ‘There was no change in the pattern of cost differences between older and younger age groups even when we stratified patient groups by gender.’
      • ‘Before randomization, patients were stratified according to tumor resection status.’
    2. 1.2Place (seeds) close together in layers in moist sand or peat to preserve them or to help them germinate.
      • ‘Seeds were collected from individual plants and sown on moist soil, stratified for 4 days, and grown for 4 weeks.’
      • ‘In the third cohort, a total of 145 seeds were cold stratified for 30 days and then checked for germination on filter paper in a petri dish.’
      • ‘When dry-dormant fruits were stratified for 0-6 weeks a rise in germination potential was evident with progressive chilling.’
      • ‘Since plant communities could influence soil processes, the plots were stratified into two broad vegetation classes: conifer and hardwood.’
      • ‘The seeds were stratified and germinated in a greenhouse at Rutgers University.’
      • ‘Seeds were stratified at approximately 5°C in damp paper towels for 2-4 weeks and planted in flats.’
      • ‘Within each plot, monitoring sites were stratified by topography (into slopes and drainage lines) and proximity to the remnant edge (into inner and outer zones).’
      • ‘Seeds for the spring plantings were cold stratified for 14 days to simulate the cold experienced by overwintering seeds.’
      • ‘One dish containing 50 seeds was stratified per replicate.’
      • ‘Seeds were imbibed and cold stratified in darkness for 4 days at 4° to induce germination.’
      • ‘Seeds were stratified at 4°C, under moist conditions for 2 weeks before planting.’
      • ‘Because Dogwood seeds have a very hard outer coating on the seed, they need to be pretreated or stratified before they will germinate.’
      • ‘The 20 plants from each maternal family were stratified among ten blocks in the greenhouse, with two from each family in each block.’
      • ‘Fruits had the pericarps removed and the seeds were stratified.’
      • ‘One hundred and fifty stratified seeds were not used in this trial and continued to be stored in the freezer for a total of six months.’
    3. 1.3[no object](of seeds) be germinated by stratifying.
      ‘if you want to sow your own mistletoe, collect ripe berries and store them in moist sand to stratify’
      • ‘Cold and moist conditions are necessary in order to stratify and break the seeds' dormancy.’
      • ‘Untreated seed can be planted in the late summer/early fall and allowed to stratify under natural conditions.’

Pronunciation:

stratify

/ˈstradəˌfī/