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’
    • ‘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.’
    • ‘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.’
    • ‘The continental crust is not stratified like the oceanic crust and so does not have a characteristic seismic velocity structure.’
    • ‘Within the socially stratified Graeco-Roman world the exchange of services were never voluntary, but always reciprocal.’
    • ‘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.’
    • ‘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 measured succession crops out continuously and is well stratified.’
    • ‘Many Cameroonians have a highly stratified social structure.’
    • ‘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.’
    • ‘Published data from a lake and diurnally stratified river weir pool are used here to verify a minimum thermocline depth hypothesis proposed by others.’
    • ‘This contrasts with the lithological association recognized in the main parts of the Moine succession in which stratified calcareous rocks are absent.’
    • ‘The system was stratified, but social mobility was possible.’
    • ‘The Copper Harbor Conglomerate consists of crudely stratified pebble-to-boulder conglomerate with thin beds of sandstone.’
    • ‘This field experiment was conducted in a deep, stratified lake that typically displays coexistence of multiple Daphnia species.’
    • ‘The correlation between the rigid, socially stratified school system in Germany and the tragedy of Erfurt was striking.’
    • ‘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.’
    • ‘Turbulence within the thermocline of two thermally stratified lakes - Lake Biwa, Japan, and Lake Kinneret, Israel - was investigated using a portable flux profiler.’
    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).’
      • ‘With this index, patients are stratified into three risk categories based on their total points.’
      • ‘In a society stratified by economic classes, economic slavery will continue to exist even if the conditions for its abolition are possible.’
      • ‘They stratified patients into five risk classes according to 20 clinical and laboratory variables, and found a clear correlation between mortality and risk class.’
      • ‘Researchers stratified patients undergoing urologic surgery by invasiveness of the procedure and degree of contamination.’
      • ‘Patients were stratified into three groups on the basis of the likelihood of bacteremia.’
      • ‘Patients were then stratified into cost deciles.’
      • ‘Before randomization, patients were stratified according to tumor resection status.’
      • ‘We stratified patients by age and sex and calculated rates for all observations.’
      • ‘To optimise treatment, patients should be stratified into risk categories to allow the most appropriate prophylactic measure to be used.’
      • ‘Patients were stratified by their eligibility for standard anticoagulation and then randomly assigned to one of three treatment groups.’
      • ‘In addition, patients were stratified on the basis of severity of illness and age.’
      • ‘The Osserman scale is a common classification scheme used to stratify patients with myasthenia gravis.’
      • ‘There was no change in the pattern of cost differences between older and younger age groups even when we stratified patient groups by gender.’
      • ‘We stratified patients in each centre according to degree of obstruction and randomised them to treatment by consecutive sealed opaque envelopes.’
      • ‘For randomisation, patients were stratified according to hospital and treatment intent.’
      • ‘Urbanization encouraged commercialized leisure, stratified by social class and varying among different immigrant groups.’
      • ‘The International Obesity Task Force has stratified patients into different classes of obesity.’
      • ‘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.’
      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’
      • ‘Because Dogwood seeds have a very hard outer coating on the seed, they need to be pretreated or stratified before they will germinate.’
      • ‘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.’
      • ‘When dry-dormant fruits were stratified for 0-6 weeks a rise in germination potential was evident with progressive chilling.’
      • ‘Seeds were collected from individual plants and sown on moist soil, stratified for 4 days, and grown for 4 weeks.’
      • ‘The 20 plants from each maternal family were stratified among ten blocks in the greenhouse, with two from each family in each block.’
      • ‘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.’
      • ‘One dish containing 50 seeds was stratified per replicate.’
      • ‘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.’
      • ‘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 were stratified at approximately 5°C in damp paper towels for 2-4 weeks and planted in flats.’
      • ‘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.’
      • ‘Fruits had the pericarps removed and the seeds were stratified.’
      • ‘Seeds for the spring plantings were cold stratified for 14 days to simulate the cold experienced by overwintering seeds.’
    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

/ˈstradəˌfī//ˈstrædəˌfaɪ/