Definition of stratify in US English:

stratify

verb

[with object]usually as adjective stratified
  • 1Form 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 continental crust is not stratified like the oceanic crust and so does not have a characteristic seismic velocity structure.’
    • ‘The measured succession crops out continuously and is well stratified.’
    • ‘The predictor lakes were Trout Lake, a strongly stratified lake, and Allequash, a poorly stratified lake.’
    • ‘Within the socially stratified Graeco-Roman world the exchange of services were never voluntary, but always reciprocal.’
    • ‘The origin of ironstone can be thought of as a layer-by-layer replacement process of primarily stratified rocks that were subjected to shearing.’
    • ‘Some andesitic and felsic intrusions created a minor, stratified volcaniclastic component via hydrovolcanic eruptions.’
    • ‘The Copper Harbor Conglomerate consists of crudely stratified pebble-to-boulder conglomerate with thin beds of sandstone.’
    • ‘The US is, finally, among the most socially stratified countries in the world.’
    • ‘Published data from a lake and diurnally stratified river weir pool are used here to verify a minimum thermocline depth hypothesis proposed by others.’
    • ‘Many Cameroonians have a highly stratified social structure.’
    • ‘In northern Portugal, nicknames are extremely important as terms of reference that connote moral equivalence in otherwise socially stratified rural communities.’
    • ‘This field experiment was conducted in a deep, stratified lake that typically displays coexistence of multiple Daphnia species.’
    • ‘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 correlation between the rigid, socially stratified school system in Germany and the tragedy of Erfurt was striking.’
    • ‘Turbulence within the thermocline of two thermally stratified lakes - Lake Biwa, Japan, and Lake Kinneret, Israel - was investigated using a portable flux profiler.’
    • ‘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 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.’
    • ‘The system was stratified, but social mobility was possible.’
    1. 1.1 Arrange or classify.
      ‘stratifying patients into well-defined risk groups’
      • ‘Patients were stratified according to the number of predictive factors present and divided into three risk categories (low, moderate, and high).’
      • ‘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.’
      • ‘In addition, patients were stratified on the basis of severity of illness and age.’
      • ‘Patients were stratified into three groups on the basis of the likelihood of bacteremia.’
      • ‘In a society stratified by economic classes, economic slavery will continue to exist even if the conditions for its abolition are possible.’
      • ‘There was no change in the pattern of cost differences between older and younger age groups even when we stratified patient groups by gender.’
      • ‘Researchers stratified patients undergoing urologic surgery by invasiveness of the procedure and degree of contamination.’
      • ‘After a three month dietary run-in period patients were stratified on the basis of fasting plasma glucose concentration and body weight.’
      • ‘We stratified patients in each centre according to degree of obstruction and randomised them to treatment by consecutive sealed opaque envelopes.’
      • ‘To optimise treatment, patients should be stratified into risk categories to allow the most appropriate prophylactic measure to be used.’
      • ‘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.’
      • ‘Before randomization, patients were stratified according to tumor resection status.’
      • ‘With this index, patients are stratified into three risk categories based on their total points.’
      • ‘Patients were then stratified into cost deciles.’
      • ‘Subsequent analyses were stratified by gender.’
      • ‘The International Obesity Task Force has stratified patients into different classes of obesity.’
      • ‘Patients were stratified by their eligibility for standard anticoagulation and then randomly assigned to one of three treatment groups.’
      • ‘They stratified patients into five risk classes according to 20 clinical and laboratory variables, and found a clear correlation between mortality and risk class.’
      categorize, class, group, put into sets, grade, rank, rate, order, organize, range, sort, type, codify, bracket, systematize, systemize, catalogue, tabulate, list, file, index
      View synonyms
    2. 1.2 Place (seeds) close together in layers in moist sand or peat to preserve them or to help them germinate.
      ‘rose seeds stratified in November may be sown outdoors’
      • ‘One dish containing 50 seeds was stratified per replicate.’
      • ‘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.’
      • ‘Since plant communities could influence soil processes, the plots were stratified into two broad vegetation classes: conifer and hardwood.’
      • ‘Seeds were collected from individual plants and sown on moist soil, stratified for 4 days, and grown for 4 weeks.’
      • ‘Seeds were imbibed and cold stratified in darkness for 4 days at 4° to induce germination.’
      • ‘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.’
      • ‘Because Dogwood seeds have a very hard outer coating on the seed, they need to be pretreated or stratified before they will germinate.’
      • ‘Seeds for the spring plantings were cold stratified for 14 days to simulate the cold experienced by overwintering seeds.’
      • ‘Seeds were stratified at 4°C, under moist conditions for 2 weeks before planting.’
      • ‘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).’
      • ‘The 20 plants from each maternal family were stratified among ten blocks in the greenhouse, with two from each family in each block.’
      • ‘When dry-dormant fruits were stratified for 0-6 weeks a rise in germination potential was evident with progressive chilling.’
      • ‘The seeds were stratified and germinated in a greenhouse at Rutgers University.’
      • ‘Fruits had the pericarps removed and the seeds were stratified.’
    3. 1.3no 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//ˈstrædəˌfaɪ/