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Explanation: These are the standard terms used, especially for employment contracts.
E.g.: "Under the current regulations, part-timers must compare themselves to full-timers employed under the same type of contract. This means, for example, that a part-timer on a fixed-term contract must compare him or herself with a full-timer on a fixed-term contract, and not with a full-timer on a permanent contract."
From UK Department of Trade & Industry
"Marking the end of the first phase of consultation on the right of employees on fixed-term contracts, the government has put forward its second draft of the Fixed-Term (Prevention of Less Favourable Treatment) Regulations. The latest draft is broadly similar to the original proposal but a few seemingly minor changes may have a significant impact on the employment rights of thousands of British fixed-term workers. If the regulations get adopted in its [sic] current form, a right not to be treated less favourably than a comparable permanent employee will only apply to fixed-term "employees"."