One who applies, executes or imposes a partition, division or separation(noun)
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Use "partitioner" in a sentence
"If you already created a partition with the (otherwise very nice) Ubuntu partitioner, you can change it from Fedora using: mkfs. ext3 - I 128/dev/sda1"
"Before developing custom partitioner this will be part two of the series work stealing part must be in place:"
"If he lends it to a proprietor, he seems to belong to the class of proprietors, and he becomes co-partitioner in the property; the income of the land is destined to the payment of the interest of his trust; the value of the funds is equal to the security of his capital."