As per the definition of Census of India, a ‘marginal worker’ is a person who works for:

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According to the Census of India, a "marginal worker" is defined by the number of days worked in the reference year. Step-by-step:

- The Census distinguishes between "main workers" and "marginal workers" based on days worked. 
- A main worker works for at least $183$ days (i.e., six months) in the year. 
- A marginal worker works for less than $183$ days (i.e., fewer than six months) in the year.

Therefore option (1) matches the official definition. Options (2), (3) and (4) are incorrect: (2) is the definition of a main worker, (3) (eight months) exceeds $183$ days, and (4) ($83$ days) is not the standard cutoff.

FINAL_ANSWER: a

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