The word is in the Wiktionary

9 short excerpts of Wiktionnary (A collaborative project to produce a free-content dictionary.)

— English words —

• iff conj. (Mathematics, logic) Short for if and only if.
• iff conj. Obsolete spelling of if.
• IFF prop.n. Initialism of Interchange File Format, a file format standard developed for Amiga computers.
• IFF n. Initialism of identification friend or foe.

— Foreign word, define in English —

• Welsh
  • -iff suff. (South Wales, colloquial) verb suffix for the third-person singular future.

— English word, defined in German —

• iff Konj. Mathematik: genau dann, wenn, dann und nur dann, wenn.

— English words, defined in French —

• iff conj. (Logique, Mathématiques) Si et seulement si, ssi.
• IFF n. (Militaire) Transpondeur ayant permis de distinguer les aéronefs alliés durant la Seconde Guerre mondiale.

— English word, defined in Spanish —

• iff conj. Matemáticas, Lógica. Si y solo si.

36 English words from 5 English definitions

Amiga and colloquial computers developed file file␣format foe for format friend future identification if␣and␣only␣if Initialism Interchange logic Mathematics Obsolete only only␣if person Short Short␣for singular South South␣Wales spelling standard suffix the third third␣person third-person␣singular verb Wales

6 English words from 4 foreign definitions

durant les nur Seconde solo und

24 foreign words from 4 foreign definitions

aéronefs alliés ayant dann distinguer genau Guerre Guerre␣mondiale Lógica Logique Matemáticas Mathematik Mathématiques Militaire mondiale permis Seconde␣Guerre␣mondiale seulement seulement␣si Si␣et␣seulement␣si Si␣y␣solo␣si ssi Transpondeur wenn

8 suffixes (New words found by adding one or more letters at the end of the word.)

iffy iffen iffier iffily Iffley iffiest iffiness Iffley␣College

1484 times in the middle (New words found by adding letters in front and at the end of the word.)

biffo biffs biffy diffs giffy hiffs jiffs jiffy Jiffy LIFFE miffs miffy niffs niffy piffs riffs riffy tiffs Tiffs TIFFs Tifft tiffy Tiffy yiffs yiffy ziffs Ziffs Aliffs biffed biffer biffin Biffle chiffs Cliffe cliffs Cliffs cliffy coiffe diffed diff␣EQ differ diffix Eiffel Giffee Giffen Giffin giffle gliffs griffe Griffo +1434 words

171 prefixes (New words found by adding one or more letters in front of the word.)

AIFF biff BIFF diff diff. hiff jiff miff niff piff riff RIFF tiff Tiff TIFF viff yiff ziff Ziff Aliff chiff cliff Cliff gliff griff Griff Iliff quiff Reiff skiff Skiff sniff spiff stiff Stiff triff whiff Califf Daniff finiff goniff Haniff McNiff spliff tariff xeriff bailiff Bailiff bayliff Braniff +121 words

One word-in-word RTL (Word found written from right to left, inside the word. Minimum size 3 letters.)

FFI

3 anagrams (New words found by changing the order of the letters.)

FFI FIF Fif.

39 anagrams found with an extra letter (New words formed with all the letters from the word and an extra letter.)

AIFF biff BIFF diff diff. FaiF FAIF FFIs FHIF fief Fifa FIFA fi␣fa fi.␣fa. fife Fife fifi Fifi fi-fi FIFO fift FILF FYFI hiff iffy JFIF jiff miff niff piff riff RIFF tiff Tiff TIFF viff yiff ziff Ziff

8 anagrams found minus a letter (New words formed with all the letters from the word minus a letter.)

ff FF ff. fi Fi FI if IF

52 cousins (New words found by changing only one letter.)

aff AFF aff. BFF eff EFF FFF IAF IBF ICF IDF IEF IFA IFC Ife IFI if'n IFO IFR ifs IFs IFS if't IFU IFV -ify IGF IMF INF inf. IOF IPF IRF ISF ITF IVF IWF JFF LFF off -off off- off. Off. pff SFF SF&F SF/F UFF wff WFF XFF

5 lipograms (New words found when removing only one letter.)

ff FF ff. if IF

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