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  2. Ordinal numeral - Wikipedia

    en.wikipedia.org/wiki/Ordinal_numeral

    The first two in the sequence are by far the most common; 'tertiary' appears occasionally, and higher numbers are rare except in specialized contexts ('quaternary period'). The Greek series proto- , deutero- , trito- , ... is only found in prefixes, generally scholarly and technical coinages, e.g. protagonist, deuteragonist, tritagonist ...

  3. Wikipedia : Primary Secondary and Tertiary Sources

    en.wikipedia.org/wiki/Wikipedia:Primary...

    These examples demonstrate why primary, secondary, and tertiary source definitions can be difficult for some editors to grasp, and a source for contention. While it is useful to grasp these distinctions, it is most important to just keep focused on using these sources in a manner which does not involve original research.

  4. Economic sector - Wikipedia

    en.wikipedia.org/wiki/Economic_sector

    Percentages of a country's economy made up by different sectors. Countries with higher levels of socio-economic development tend to have proportionally less of their economies operating in the primary and secondary sectors and more emphasis on the tertiary sector. The less developed countries exhibit the inverse pattern.

  5. Educational stage - Wikipedia

    en.wikipedia.org/wiki/Educational_stage

    Educational stages are subdivisions of formal learning, typically covering early childhood education, primary education, secondary education and tertiary education.The United Nations Educational, Scientific and Cultural Organization recognizes nine levels of education in its International Standard Classification of Education (ISCED) system (from Level 0 (pre-primary education) through Level 8 ...

  6. Three-sector model - Wikipedia

    en.wikipedia.org/wiki/Three-sector_model

    Primary sector: 40%; Secondary sector: 40%; Tertiary sector: 20%; More machinery is deployed in the primary sector, which reduces the number of workers needed to produce a given output of food and raw materials. Since the food requirements of a given population do not change much, employment in agriculture declines as a proportion of the ...

  7. Wikipedia:Identifying and using primary sources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Identifying_and...

    A primary source can have all of these qualities, and a secondary source may have none of them. Deciding whether primary, secondary or tertiary sources are appropriate on any given occasion is a matter of good editorial judgment and common sense, not merely mindless, knee-jerk reactions to classification of a source as "primary" or "secondary".

  8. Wikipedia:Evaluating sources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Evaluating_sources

    Sources of information are commonly categorized as primary, secondary, or tertiary sources.In brief, a primary source is one close to the event with firsthand knowledge (for example, an eyewitness); a secondary source is at least one step removed (for example, a book about an event written by someone not involved in it); and a tertiary source is an encyclopaedia or textbook that provides a ...

  9. Industry classification - Wikipedia

    en.wikipedia.org/wiki/Industry_classification

    At the top level, they are often classified according to the three-sector theory into sectors: primary (extraction and agriculture), secondary (manufacturing), and tertiary (services). Some authors add quaternary (knowledge) or even quinary (culture and research) sectors. Over time, the fraction of a society's activities within each sector changes.