The phrase "singular purpose" means having one specific goal or objective, focusing all your efforts and attention towards achieving it. Full definition
you think a normal mother props up her kid on a stool and sticks her breast in his mouth for the express and singular purpose of staging a provcative mass circulated photograph? (amotherinisrael.com)
In a monochromatic world where scientific advancement allows for optimization of life itself, a ruling class of scientists uses CRISPR technology to produce classes of civilians with singular purposes: farmers resistant to sunlight, doctors with photographic memories, and fearless police officers. (science.sciencemag.org)
This is the wing of a male bee, or drone, whose singular purpose in the colony is to mate with the queen. (discovermagazine.com)