A temporary replacement for another, especially at a job.
He went in to the Calsag bar to wrangle two fill-ins for the Goldenhoys as ordered.
A substitution.
All our language is loose: whatever one means to say, all words are fill-ins for other words - as any cursory glance at a dictionary reveals.
An intermediate result that must be stored temporarily during the course of a sparse matrix computation.
When a fill-in, aᵢⱼ⁽ˢ⁾ is created in the course of the computation, it may be necessary to make copies of the contents of certain parts of the ALU and CNLU at the ends of these arrays.
From the verb phrase fill in.
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