The prefix ex- means "going out" - compare an excursion with an "incursion" - defined as "an aggressive attack into a place".
According to the FAA, a runway incursion is "Any occurrence at an aerodrome involving the incorrect presence of an aircraft, vehicle or person on the protected area of a surface designated for the landing and take off of aircraft." It's "significant" because people get killed that way. Runway incursion results in collosion of aircraft on the ground when they are fully loaded with fuel and people. Runway incursion is when something enters an active runway. Runway excursion is when a aircraft departs a runway in error.
Teachers at my daughter's school are now using the word "incursion" for events held within a school, as opposed to "excursions" where children leave the school to enjoy entertainment/a field trip to learn something etc. An example of their use of the word "incursion": a poet coming to speak to the children in the school. I just can't find anywhere how the use of this word started in the education field, its logic (or lack of it). To me an incursion is an act of aggression or a hostile attack. I have found one definition that has some semblance of relationship: "the act of entering - or running into" as in an incursion of flood water - again there is a negative connotation. Does this relate to the common use of "incursion" used frequently by teachers?? I don't know.... but its use still grates on me.
There seems to be an incursion coming our way, sir. We must stop this incursion at once!
The noun "incursion" means an illegal or unauthorized entrance (potentially an invasion or attack) by a foreign force into sovereign territory, or territory claimed as sovereign. Two prepositions that are often seen following this noun are "by" (the entity or persons making the incursion) and "into" (the location where the incursion occurs).
Incursion maybe/is non-permanent; invasion is more likely permanent
Excursion is a noun.
Excursion is a noun.
The Excursion was created in 1814.
The Slitheen Excursion was created in 2009.
Excursion to Tindari was created in 2000.
The cast of Incursion - 2013 includes: Sophia Freeman as Sophia Zuqiang Peng as Zack Andrius Svilys as Andrius