Plural of definiendum; things that are to be defined or need defining in logic and philosophy.
From Latin definiendum (thing to be defined), the future passive participle of definire. The plural -a is Latin neuter plural.
This is a highly technical philosophical term—in formal logic, 'definienda' are the concepts waiting to be defined, while 'definientia' are the definitions themselves. It's the vocabulary scholars use to talk about the structure of meaning itself.
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