Merriam-Webster Collegiate Dictionary - collaterally

 adverb see collateral I COLLATION  noun  Date: 14th century  1. Middle English, from Anglo-French, from Medieval Latin ~-, collatio, from Late Latin, conference, from Latin, bringing together, comparison, from conferre (past participle collatus) to bring together — more at confer, tolerate  a. a light meal allowed on fast days in place of lunch or supper  b. a light meal  2. Middle English, from Latin ~-, collatio the act, process, or result of collating