Acronyms, Abbreviations, and Initialisms.
All human edited and we add more daily

The meaning of the Acronym 21D is...

21D is

  • Lake Elmo Airport, Lake Elmo, Minnesota USA

21D is also in:

Acronym Definition Searched: SPASM 29487 SRQ 32432 MPV NMHCC 59604 COS KRA 28790 WJWC DFT MNC 22936 TDR