Here's what it said: "〔名〕仏語。寿命が一〇歳より百年ごとに一歳を増して八万四千歳に達する間と、これと反対に、八万四千歳より百年ごとに一歳を減らして一〇歳に至る間とをいう。"
Wonder why it says "一〇歳" instead of "十歳"?

ddofbud

actually, i think my poor translation of nikk was responsible for the buddhist 
'math error'.  now it is merely a biology error

@@ -13,1 +13,1 @@
-<gloss>period during which a human lifespan increases from ten years to 84,000 years (by increments of 100) and then decreases back to ten (by decrements of 100)</gloss>
+<gloss>16,800,000-year period over which a human lifespan increases from ten years to 84,000 years (by one year per century) and then decreases back to ten (by one year per century)</gloss>

clarifying

@@ -13,1 +13,1 @@
-<gloss>period during which a human lifespan increases from ten years to 84,000 years (by increments of 100 years) and then decreases back to ten</gloss>
+<gloss>period during which a human lifespan increases from ten years to 84,000 years (by increments of 100) and then decreases back to ten (by decrements of 100)</gloss>

nikk, ddofbud
-
did not look for evidence of meaning submitted since no ref was given.  this is 
what dictionaries have

it does not seem to have been evident to the buddhists that 10+100n=84000 is 
false for all n

@@ -8,1 +8,1 @@
-<reb>いちそういちげん</reb>
+<reb>いちぞういちげん</reb>
@@ -12,2 +12,2 @@
-<misc>&id;</misc>
-<gloss>the principle that "if one is added, one is taken away"</gloss>
+<field>&Buddh;</field>
+<gloss>period during which a human lifespan increases from ten years to 84,000 years (by increments of 100 years) and then decreases back to ten</gloss>