Meaning of FOLD in English

FOLD

n.

Function: suffix

Etymology: Middle English, from Old English -feald; akin to Old High German -falt -fold, Latin -plex, -plus, Old English fealdan

1 : multiplied by (a specified number) : times ― in adjectives <a six fold increase> and adverbs <repay you ten fold >

2 : having (so many) parts <three fold aspect of the problem>

Merriam Webster Collegiate English Dictionary.      Merriam Webster - Энциклопедический словарь английского языка.