The Term "Overture" used in Concert Band Pieces

Hi guys, I would like to ask if anyone here knows exactly what an "overture" means when used in modern-day context for concert band pieces. For example Alvamar Overture by James Barne or Persis Overture by James L. Hosay. Or even when they say "blah blah piece is a fantasy overture .. . . .."

As far as I know, and some definition from wiki "Overture (from the French ouverture, meaning opening) in music is the instrumental introduction to a dramatic, choral or, occasionally, instrumental composition. During the early Romantic era, composers such as Beethoven and Mendelssohn began to use the term to refer to instrumental, programmatic works that presaged genres such as the symphonic poem."

Or even the term Concert Overture is used in reference to pieces from early 19th century that were "intended specifically as an individual concert piece without reference to stage performance and generally based on some literary theme"

But it seems that the term "Overture" is really used all over the place and in so many band pieces nowadays that I have no idea how or why is it used. Does it now just mean a piece that is intended to be played in concert? Do they follow some sort of similar structure or form?

Overtures, at least what my junior high band director told me, follow an ABA form. (Or at least, a rather loose ABA form). Formwise, that's all I remember about the generic overture. :]

Overtures have no common form. The french overture has a multi-movement structure (William Tell), while other overtures follow the sonata-allegro form with a slow introduction (such as Barber of Seville).

An overture is a piece written to be played before a play, opera, or oratorio begins, often based on the main themes of the music of the production.

However, Overture also refers to a piece meant to be played first at a concert, such as Mendelssohn's Hebrides.