exchange;  interchange;  switching;  reciprocity;  barter;  substitution
 change;  conversion;  transformation;  transformation
 change of pace;  change of mood;  (mental) break (e.g. going for a walk);  refreshment
 conversion;  diversion;  changeover;  commutation;  switchover
 realization (of goods into money);  conversion (into money);  liquidation
 bargaining point;  terms of exchange;  conditions for meeting a demand
 conversion (e.g. yen to dollars);  change;  exchange;  translation (numerical)
 exchanging parts or equipment to effect a change in performance
 exchanging diary between friends (usually at school)
 downward compatible;  backward compatible;  compatible with input or components intended for lower tier or older systems, versions, etc.;  upward compatible;  forward compatible;  compatible with input or components intended for higher tier or later systems, versions, etc.
 ventilation fan;  extractor fan
 fair exchange;  equivalent exchange;  exchange of equal value
 saying in other words;  putting (something) another way
 exchange of ideas;  exchange of opinions;  brainstorming
 substitution;  replacement;  permutation;  substitution;  displacement
 turning point;  tipping point;  commutation point
 vent;  ventilation opening
 interchange;  transposition;  compatible (e.g. PC)
 upward compatible;  forward compatible;  compatible with input or components intended for higher tier or later systems, versions, etc.;  downward compatible;  backward compatible;  compatible with input or components intended for lower tier or older systems, versions, etc.
 turning point;  transition phase
 exchanging business cards
 exchangeable;  convertible;  transferable;  replaceable
 reshuffling;  job rotation
 operator (e.g. telephone)
 conversion (of paper money, esp. into specie)
 (student) exchange;  study abroad
 scene change;  cutaway;  cut
 murder swap;  murder exchange;  murder of each other's targets by co-conspirators
 (telephone) switchboard;  switchboard operator
 clearing house;  clearinghouse;  (currency) exchange;  bureau de change
 exchange (something) together
 exchange of letters;  correspondence
 ventilator;  ventilating device
 appraisal;  estimation;  valuation;  realization;  conversion (into cash)
 reconversion (of typed characters)
 selecting the wrong kanji (when typing);  kanji typo;  misconversion
 pachinko prize exchange shop;  shop where pachinko prizes are exchanged for money
 adaptation (of a poem, novel, etc.);  recasting;  rewriting;  modification;  rehashing
 inconvertible paper money;  fiat money
 selecting the wrong kanji (when typing);  kanji typo;  misconversion
 telephone switching station;  telephone exchange;  central office
 moulting season;  molting season
 collecting waste paper (old newspapers etc.) and exchanging them for tissues
 returning to profit;  turnaround
 thing bartered;  trade-in;  substitute;  replacement;  exchange
 policy shift;  policy U-turn
 hyperventilation syndrome
 convertible (corporate) bond
 differential lung ventilation;  differential pulmonary ventilation
 code conversion;  code translation
 signal transformation;  signal shaping
 replotting;  land substitution;  replotted land;  substitute lot
 exchange function;  swapping capability
 kana-kanji conversion (on a computer, etc.)
 molting;  moulting;  shedding
 coordinate transformation
 New Year party where greetings (or business cards, etc.) are exchanged
 file exchange;  file swapping;  file sharing
 backward compatible;  downward compatible
 backward compatibility;  downward compatibility
 non-conversion;  nonconversion
 converting money into goods;  purchasing
 address translation;  address mapping
 Network Address Translation
 change in mentality;  changing one's way of thinking;  adjusting psychologically to shifting circumstances
 business card exchanging party
 group paragraph conversion
 single-kanji conversion (in an input method)
 management reorganization;  management reorganisation
 Treaty of Saint Petersburg (1875);  Russo-Japanese treaty in which Japan exchanged Sakhalin for the Kuril Islands
 in other words;  that is (to say);  to put it another way
 hypoventilation;  respiratory depression
 exchange and consolidation (of lands)
 forward compatible;  upward compatible
 input of kana alone (i.e. without conversion into kanji);  input in no-conversion-mode
 forward compatibility;  upward compatibility
 allocation of replotted land;  government acquisition of land by substitution or compensation
 view transformation input priority
 global modelling transformation
 Dynamic Address Translation;  DAT
 downward compatibility;  backward compatibility;  compatibility with input or components intended for lower tier or older systems, versions, etc.;  upward compatibility;  forward compatibility;  compatibility with input or components intended for higher tier or later systems, versions, etc.
 sister chromatid exchange
 noncommutative geometry;  NCG
 composite modelling transformation
 electronic data interchange;  EDI
 DAT;  Dynamic Address Translation
 private automatic branch exchange;  private branch exchange;  PABX;  PBX
 congenital central hypoventilation syndrome;  CCHS
 switching capacity;  switching ability
 toll switch;  TS;  trunk exchange
 conversion station (power, frequency);  converter station
 toll switch;  TS;  trunk exchange
 two-dimensional fast Fourier transform
 decimal to binary conversion
 upward compatibility;  forward compatibility;  compatibility with input or components intended for higher tier or later systems, versions, etc.;  downward compatibility;  backward compatibility;  compatibility with input or components intended for lower tier or older systems, versions, etc.
 digital-to-analog converter
 private branch exchange;  PBX
 viewing transformation;  normalization transformation;  window-to-viewport transformation
 workstation transformation
 (address) translation exception
 page translation exception
 local modelling transformation
 replaceable parameter data
 Fast Fourier Transform;  FFT
 frequency-changer station;  frequency converter station
 analog-digital converter;  AD converter;  ADC
 analog-to-digital converter;  AD converter;  ADC
 gender changer;  sex changer
 digital-to-analog converter;  DA converter;  DAC
 digital-to-analog converter;  DA converter;  DAC
 normalization transformation;  Viewing transformation;  window-to-viewport transformation
 inverse fast Fourier transform
 perspective transformation
 Discrete Cosine Transform;  DCT
 discrete Fourier Transform;  DFT
 inverse Fourier transform
 rigid-body transformation
 cryptocurrency exchange;  crypto exchange;  digital currency exchange
 land replotting plan;  replotting plan
 interchangeability;  interoperability
 staticizer;  serial-parallel converter
 serializer;  parallel-serial converter;  dynamicizer
 private branch exchange;  PBX
 replaceable character data
 American Standard Code for Information Exchange;  ASCII
 virtual (switching) office
 simple change (horse gait)
 window;  viewport transformation;  viewing transformation
 Adaptive Transform Coding;  ATC
 business card exchanging party
 transfer (of a pension);  rollover
 signal converter;  inverter
 deionized water;  DI water
 foreign currency translation
 substitute character;  SUB
 page replacement algorithm
 data switching exchange;  DSE
 DXC;  Data Exchange Controller
 electromagnetic compatibility
 demand for replacement;  request for replacement;  need for replacement
 Abelian group;  commutative group
 non-Abelian group;  noncommutative group
 advanced thermal converter reactor
 diaper changing station;  nappy changing stand
 file replacement software
 Columbian exchange;  widespread exchange of animals, plants, culture, disease, and ideas between the Old and New Worlds
 (logical) conversion (transposition of subject and predicate to form a new proposition)
 exchange of silver generals
 stock exchange percentage
 digital data exchange network
 binary level compatibility
 compatibility test;  interoperability test
 replacement of lost teeth