Kangaroo word: partially
Joey word: partly
Definitions in relation to their use in kangaroo words, taken from Google Dictionary, and edited for formatting.
The letters P, A, R, T, L, and Y found within the kangaroo word “partially” arrange in the listed order to complete the joey word “partly”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share a similar meaning: to a certain extent.