compendium (n.) Look up compendium at Dictionary.com
1580s, from Latin compendium "a shortening, saving," literally "that which is weighed together," from compendere "to weigh together," from com "with, together" (see com-) + pendere "to hang, cause to hang; weigh; pay" (from PIE root *(s)pen- "to draw, stretch, spin"). Borrowed earlier as compendi (mid-15c.).