Sentence:  We would like now to show that the counterpart of the conditional probability ℘(jǀk) in quantum mechanics is indeed the probability of a final detection event, which, given a certain experimental context (a <WSD>premeasurement</WSD>), allows us to finally ascribe a property to the object system (the system that has been measured). 
Meaning of the word marked with <WSD> tags:  The preparation of a system for obtaining a desired result, typically the confinement of an object system in a small but macroscopic region of space-time.