Sindarin 

genedia-

verb. to reckon, to reckon, *calculate

A verb implied by the noun genediad “reckoning” from the King’s Letter as in genediad Drannail “Shire-reckoning” (SD/129). This verb is clearly go- “together” combined with nedia- “count”. It seems like genedia- means using numbers as a way of organizing something, hence perhaps also “✱calculate”.