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R & D
R/D
R.E.
r.f.
R factor
r.h.
R.I.B.
R.I.P.
r.m.m.
R’n’B
R.N.C.
R.Q.
R.S.V.P.
r.v.
R-value
RA
Ra (1)
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R.A.

R.A.


abbr 
Definition:
 
1. navy Rear Admiral

2. army Regular Army

3. Research Assistant

4. education Resident Advisor

5. astronomy right ascension

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