Has anybody ever noticed the similarity in both the words and technique of the traspie and the strathspey? Is there something to it? Where did they both come from? I cannot find a serviceable dictionary anywhere.
Traspie is Spanish. It obviously comes from tras ("behind", sometimes sort of "through", ex. tras una larga carrera, "throughout a long career") and pie (foot). It's a little syncopation we use in milonga a lot and in tango some. Some people put one foot behind the other and turn a step into two steps. I suppose the triple steps I have seen people do could be called traspie too.
As far as I found out, strathspey is of celtic, and traspie is of latin origin. Also the concepts behind the words are opposite. Strathspey is accented on the strong beats, whereas traspie is a syncopated or double tempo step.
As a type of music strathspey contains many dot-cut 'snaps'. A so-called Scotch snap is a short note before a dotted note, which in traditional playing is generally exaggerated rhythmically for musical expression.
Since "The Irish repertoire also gravitates to tunes with long passages of triplets" I would guess the dancing would tend towards "triplets," also.