round up your friends on the faculty from other departments
Subject areas: English, Social Studies, Math, Computer Science, Modern Languages
Try to commit to a 15-minute discussion of the concept, twice a week, for at least two weeks, three or more if a complex assignment arises from the discussion.
Ask your students to record as many words as they can, related to the concept of boundaries, borders, inside and outside. The math students, for example, might come up with perimeter, circumference, or even polygon. They could discuss how the term perimeter is neutral as to shape (circles, squares, dodecahedrons all have a perimeter), but absolute when it comes to separation (a point is either inside or outside).
In English class, you might have the teacher ask a few impertinent questions about a figure from Geometry class:
The Algebra or Geometry teacher can send representatives from her class to represent for Math during the English class discussions. Alternatively, the two (or more) classes could be brought together to talk.
The English students could also look for prefixes and suffixes, and perhaps order the terms on the lists along the lines of the table on the right. Further, they could use dictionaries to examine etymologies and the various senses of meaning, such as the adjective circular and the noun circular and the various discrete meanings of the verb circulate.
The students in the class who speak other languages than English might add translations, as well as any other terms. Spanish speakers might offer a fuera or exterior, for example. The same kind of contribution could come from any students taking other foreign languages.