Basically, it means 'limited' in some way, Hanuman. If I say that in the sentence, 'I bought a green snake yesterday', 'green' qualifies or limits 'snake' by excluding all brown or yellow ones. I am unclear, however, as to how an infinitive could qualify a verb, other than that it would represent only one form of the verb-- thus, 'to matriculate' would qualify 'matriculate' by excluding 'have been matriculating', etc.
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