The position, rank, or status of being a giant; the condition of gianthood; sometimes used to mean a grand ship or vessel (humorous or archaic).
Compound of 'giant' + '-ship' (a suffix forming nouns denoting position, rank, condition, or craft). The '-ship' suffix comes from Old English 'scipe' and was historically productive for ranks and stations.
The '-ship' suffix is especially common for ranks ('kingship', 'priesthood') and crafts ('horsemanship', 'penmanship'), so 'giantship' feels at home—though it's quite rare, it semantically fits English's patterns perfectly.
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