(if) by some chance;  by some possibility;  in the unlikely event that;  (unlikely event of) emergency;  the worst(-case scenario)
 unity;  consolidation;  uniformity;  unification;  compatible
 (unlikely event of) emergency;  the worst(-case scenario); (lit.) 10000 to 1;  (if) by some chance;  by some possibility;  in the unlikely event that
 identical;  same;  one and the same;  fair;  equal treatment;  without discrimination
 one;  same (mind, path, etc.)
 purity;  homogeneity;  unadorned
 solely;  entirely;  only;  or
 one by one;  in detail;  minutely
 single;  simple;  sole;  individual;  unitary
 viewing and treating as one;  regarding as the same;  equating one thing with another;  identification
 sense of unity;  sense of oneness
 unification;  union;  oneness
 having only tiles of one suit and no honor tiles (meld)
 unification of the whole country
 choosing between two things;  two choices
 concentration of mind;  mental concentration (on some task)
 homogenization;  homogenisation
 gender identity disorder;  GID;  gender dysphoria
 dissociative identity disorder
 choosing one from among several;  multiple choice
 exclusively;  (taking) best care
 Unification Church (religious movement started by Reverend Sun Myung Moon)
 uniformity;  standardization;  standardisation
 lack of uniformity;  unevenness;  inequality;  heterogeneous;  nonuniform
 to be faced with the choice between two alternatives;  to be presented with two difficult choices
 the first in history;  only once in history
 collective view (opinion)
 standardization;  standardisation
 to concur;  to be the same (thought, opinion, etc.);  to have the same way of doing
 law of identity;  principle of identity
 joint action;  acting in unison
 awareness comes only through practice
 simplification;  unification
 pure and unadulterated;  pure in heart;  simplehearted
 racially homogeneous;  monoracial
 same plane;  same level;  flush (with);  even (with)
 ethnically homogeneous nation;  racially homogeneous nation
 Very sincerely yours; (arch.)  different
 coplanar;  in the same plane;  flush;  even (with)
 Sincerely yours (with the nuance of "please excuse the brevity of this letter")
 nationwide local elections
 choosing between two things;  two choices
 Italian unification movement;  Risorgimento
 (principle of) equal pay for equal work
 dodoitsu;  unrhymed non-metrical Japanese popular love song or limerick in the 7-7-7-5 syllable pattern
 standardization;  standardisation
 monolingual;  homogeneous (language)
 principle of identity (logic)
 uniformity of thought;  uniform thinking
 single market (e.g. European single market)
 single currency;  currency unification
 monoculture;  monocropping
 Out-of-Africa theory (positing a recent African origin for modern humans)
 the unity of knowledge and virtue
 Sakai Houitsu school;  school of Japanese painting
 standardization;  standardisation
 nationwide local elections
 Eastern Catholic Churches;  Uniate Churches;  Eastern-rite Catholic Churches
 single attachment concentrator
 pursuing one overriding objective while forsaking all the others
 single attachment station
 single step operation;  step-by-step operation
 functional unification grammar;  FUG
 single point of failure;  SPOF
 unification-based formalisms