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| Subject | English | Thesaurus |
| auto. | free-breathing engine | non-turbocharged engine (MichaelBurov) |
| abbr., nautic. | FREE DESPATCH | If loading/discharging achieved sooner than agreed, there will be no freight money returned. |
| abbr., insur. | Free dispatch | f.d. |
| abbr., insur. | Free of dispatch | F/dp |
| abbr., post | Friend to Friend - PLANET code program allows mailing coupons to friends for free | FTF |
| telecom., abbr. | International Toll Free Services | ITFS |