Mathematics With respect to a specified modulus: 18 is congruent to 42 modulo 12 because both 18 and 42 leave 6 as a remainder when divided by 12.
Correcting or adjusting for something, as by leaving something out of account: This proposal is the best so far, modulo the fact that parts of it need modification.
[Latin modulō, ablative of modulus, diminutive of modus, measure; see mode.]
[moj-uh-loh] 
əˌloʊ