complex;  complicated;  intricate;  mixed (feelings)
 plural;  multiple;  several
 reproduction;  duplication;  reprinting
 composite;  combined;  complex
 copying;  duplication;  reproduction;  copy
 duplication;  repetition;  overlapping;  redundancy;  restoration
 complicated and mysterious
 compound;  composite;  doubles (tennis, badminton, etc.);  place bet (in horse racing, etc.);  show bet
 copy;  reproduction;  replica;  facsimile
 two-seater (e.g. aircraft)
 conglomerate;  group of companies run as a single organization
 multi-layered;  multi-tiered;  multi-storied
 complexity;  complex;  complicated
 military-industrial complex
 double track;  two-track line
 multifunction machine;  combination printer-copier-scanner-fax
 large conglomerate;  large group of related companies
 complex;  complex (number)
 double-entry (e.g. bookkeeping)
 photocopier;  photocopying machine
 complex and subtle (delicate)
 complex and wide-ranging;  labyrinthine
 four-track rail line (two in each direction);  quadruple railway track
 compound word;  compound term
 multiple lines (of text, code, etc.)
 combined competition (usu. in skiing)
 compound note (on a harmonica)
 two-seater aeroplane;  two-seater airplane
 check all that apply (question format);  multiple answers allowed;  CATA
 simultaneously running for a seat in a single-member constituency and a seat in a proportionally represented constituency
 two-character surname (in China);  compound surname;  family name consisting of two combined names (in ancient Japan)
 complex sentence;  sentence with an independent clause and at least one dependent clause
 complex and mysterious (bizarre);  complicated and inscrutable
 double refraction;  birefringence
 double decomposition;  metathesis
 cafe providing Internet, manga browsing, etc.;  combined cafe
 quinella (bet);  dual forecast;  reverse forecast
 place bet (in horse racing, etc.);  show bet;  bet that predicts a top 2 or top 3 finish (depending on number of horses, etc. in race)
 Nordic combined (skiing event)
 military-industrial complex
 combined immunodeficiency
 complex volcano;  compound volcano
 multi-layered glass (e.g. double or triple glazing);  insulated glazing
 decryption;  decipherment;  decoding
 compound preposition;  complex preposition;  phrasal preposition
 major histocompatibility complex;  MHC
 mixed antibiotic preparations
 multidisciplinary science
 doubles (tennis, badminton, etc.)
 multiple parallel fermentation (esp. in sake brewing)
 CISC;  Composite Instruction Set Computer
 complex condition;  compound condition
 compound addition;  multiple addition
 complex regional pain syndrome;  CRPS
 specified complex tourist facilities area;  area approved for containing integrated resorts with casinos
 complex post-traumatic stress disorder;  complex PTSD
 photocopying machine;  photocopier
 double-crosspiece cross (symbol for tuberculosis prevention)
 Complex Instruction Set Computer;  CISC
 compound umbellate inflorescence;  compound umbel
 class action lawsuit;  class action
 compound ratio;  cross ratio;  compound proportion
 double sign;  plus-minus sign;  plus or minus sign
 reproduction right;  right of reproduction;  right to make copies
 restoration of power (e.g. after power failure)