eo ipso vs then

eo ipso

• Through or by that very act or quality; thereby. Compare: ipso facto. 

then

• In that case. 

• Next in order of place. 

• At that time. 

• In addition; also; besides. 

• At the same time; on the other hand. 

• Used to contradict an assertion. 

• Soon afterward. 

• Being so at that time. 

• That time