Creationists seldom if ever admit it, but to them microevolution is observed evolution and macroevolution is that which takes to long for it to be observed
Personally, I don't think this is all that bad of a definition, at least for debates as of the EvC type. It distinguishes our level of certainty and the type of evidence we have that causes us to come to a particular conclusion.
Of course, there is little need for such a distinction in scientific circles. We can just talk about evolution - change over time.
Whoever calls me ignorant shares my own opinion. Sorrowfully and tacitly I recognize my ignorance, when I consider how much I lack of what my mind in its craving for knowledge is sighing for... I console myself with the consideration that this belongs to our common nature. - Francesco Petrarca
"Nothing is easier than to persuade people who want to be persuaded and already believe." - another Petrarca gem.
Ignorance is a most formidable opponent rivaled only by arrogance; but when the two join forces, one is all but invincible.