Adjective

(-)

Freely substitutable. May be swapped at will.

Eli Whitney's development of interchangeable parts was a breakthrough for modern manufacturing. Prior to that each part had to be made custom.

* 2014 , Ian Jack, " Is this the end of Britishness", The Guardian , 16 September 2014:

The English, until relatively recently, seem to have imagined “English” and “British” to be interchangeable , as if Britain was just a bigger England.

Adjective

(-)

Unable to be seen; out of sight; not visible.

* (John Milton)

To us invisible , or dimly seen / In these thy lowest works.

*

, title=(The Celebrity), chapter=4 , passage=The Celebrity, by arts unknown, induced Mrs. Judge Short and two other ladies to call at Mohair on an afternoon when Mr. Cooke was trying a trotter on the track.

* {{quote-magazine, year=2013, month=May-June, author= William E. Conner

, title= An Acoustic Arms Race , volume=101, issue=3, page=206-7, magazine=(American Scientist) , passage=Earless ghost swift moths become “invisible ” to echolocating bats by forming mating clusters close (less than half a meter) above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them.}}

* 2013 , Jayne Smith, Guide to Basic Garment Assembly for the Fashion Industry (page 60)

The teeth on an invisible zip are different from those on a conventional zip, as they are turned onto the inside so that they do not show, giving the impression of being concealed in the seam, as seen below.

Not appearing on the surface.

(Internet) Apparently, but not actually, offline.

(psychology) That is ignored by a person.