1) Cause to become less similar 2) Change 3) Make dissimilar 4) To make dissimilar or unlike 5) To modify by dissimilation 
• (v. t.) To render dissimilar.
Dis·sim'i·late transitive verb To render dissimilar. 
[v] - become dissimilar by changing the sound qualities 2. [v] - make dissimilar 3. [v] - become dissimilar or less similar
dissimilate 1. To make dissimilar or to cause to become less similar. 2. To make or to become unlike.
verb become dissimilar or less similar; `These two related tribes of people gradually dissimilated over time`
to modify by dissimilation.