- arccos (= arcCos, arccosine)
- arccosecant (= arc cosecant)
- arccosec (= arccosecant)
- arccosh (= arcCosh)
- arccosine (= arc cosine)
- arccotangent (= arc cotangent)
- arccot (= arcCot, arccotangent)
- arccoth (= arcCoth)
- arccsc (= arcCsc)
- arccsch (= arcCsch)
- arcctg
- arc degree
- arc element
- arc function
- arch
- Archibald, R.C.
- Archimedean absolute value
- Archimedean body
- Archimedean circle
- Archimedean class
- Archimedean dual
- Archimedean dual graph
- Archimedean equivalence
- Archimedean exiom
- Archimedean field