Definition of "long-period" [long-period]

• Taking over 200 years to complete an orbit, especially said of comets (adjective)

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• "Monsoon rains were 11% above the long-period average until June 21."
• "Last week, the weather office forecast that monsoon rainfall this year is likely to be 95% of the long-period average, lower than the 98% it projected in April."
• "The Kuiper belt, domain of icy wandering dwarf planets like Pluto and Eris, extends perhaps another 30AU, before merging into the much more tenuous Hills cloud and Oort cloud, domain of loosely coupled long-period comets."