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 measured succession crops out continuously and is well stratified.’
    • ‘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.’
    • ‘Within the socially stratified Graeco-Roman world the exchange of services were never voluntary, but always reciprocal.’
    • ‘The correlation between the rigid, socially stratified school system in Germany and the tragedy of Erfurt was striking.’
    • ‘In northern Portugal, nicknames are extremely important as terms of reference that connote moral equivalence in otherwise socially stratified rural communities.’
    • ‘The predictor lakes were Trout Lake, a strongly stratified lake, and Allequash, a poorly stratified lake.’
    • ‘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 Copper Harbor Conglomerate consists of crudely stratified pebble-to-boulder conglomerate with thin beds of sandstone.’
    • ‘Some andesitic and felsic intrusions created a minor, stratified volcaniclastic component via hydrovolcanic eruptions.’
    • ‘The system was stratified, but social mobility was possible.’
    • ‘This field experiment was conducted in a deep, stratified lake that typically displays coexistence of multiple Daphnia species.’
    • ‘The US is, finally, among the most socially stratified countries in the world.’
    • ‘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.’
    • ‘Many Cameroonians have a highly stratified social structure.’
    • ‘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.’
    • ‘Published data from a lake and diurnally stratified river weir pool are used here to verify a minimum thermocline depth hypothesis proposed by others.’
    • ‘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 origin of ironstone can be thought of as a layer-by-layer replacement process of primarily stratified rocks that were subjected to shearing.’
    • ‘The continental crust is not stratified like the oceanic crust and so does not have a characteristic seismic velocity structure.’
    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).’
      • ‘In a society stratified by economic classes, economic slavery will continue to exist even if the conditions for its abolition are possible.’
      • ‘In addition, patients were stratified on the basis of severity of illness and age.’
      • ‘They stratified patients into five risk classes according to 20 clinical and laboratory variables, and found a clear correlation between mortality and risk class.’
      • ‘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.’
      • ‘After a three month dietary run-in period patients were stratified on the basis of fasting plasma glucose concentration and body weight.’
      • ‘Subsequent analyses were stratified by gender.’
      • ‘For randomisation, patients were stratified according to hospital and treatment intent.’
      • ‘Patients were then stratified into cost deciles.’
      • ‘The Osserman scale is a common classification scheme used to stratify patients with myasthenia gravis.’
      • ‘The International Obesity Task Force has stratified patients into different classes of obesity.’
      • ‘We stratified patients in each centre according to degree of obstruction and randomised them to treatment by consecutive sealed opaque envelopes.’
      • ‘Before randomization, patients were stratified according to tumor resection status.’
      • ‘Urbanization encouraged commercialized leisure, stratified by social class and varying among different immigrant groups.’
      • ‘To optimise treatment, patients should be stratified into risk categories to allow the most appropriate prophylactic measure to be used.’
      • ‘Patients were stratified into three groups on the basis of the likelihood of bacteremia.’
      • ‘Patients were stratified by their eligibility for standard anticoagulation and then randomly assigned to one of three treatment groups.’
      • ‘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.’
      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.’
      • ‘Fruits had the pericarps removed and the seeds were stratified.’
      • ‘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).’
      • ‘Because Dogwood seeds have a very hard outer coating on the seed, they need to be pretreated or stratified before they will germinate.’
      • ‘Since plant communities could influence soil processes, the plots were stratified into two broad vegetation classes: conifer and hardwood.’
      • ‘Seeds were stratified at approximately 5°C in damp paper towels for 2-4 weeks and planted in flats.’
      • ‘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.’
      • ‘Seeds were collected from individual plants and sown on moist soil, stratified for 4 days, and grown for 4 weeks.’
      • ‘The seeds were stratified and germinated in a greenhouse at Rutgers University.’
      • ‘Seeds were imbibed and cold stratified in darkness for 4 days at 4° to induce germination.’
      • ‘When dry-dormant fruits were stratified for 0-6 weeks a rise in germination potential was evident with progressive chilling.’
      • ‘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.’
      • ‘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.’
      • ‘The 20 plants from each maternal family were stratified among ten blocks in the greenhouse, with two from each family in each block.’
    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’
      • ‘Untreated seed can be planted in the late summer/early fall and allowed to stratify under natural conditions.’
      • ‘Cold and moist conditions are necessary in order to stratify and break the seeds' dormancy.’

Pronunciation

stratify

/ˈstrædəˌfaɪ//ˈstradəˌfī/