(n.) The act of identifying, or proving to be the same; also, the state of being identified.

ID card affiliation allergy anaphylaxis appellation apperception appraisal assessment assimilation association association by contiguity association of ideas authentication badge baptism calligram calling calling card card caring cataloguing categorization categorizing certification characterization chord christening clang association classification classifying coalescence combination concern connection considerateness controlled association corroboration countermark countersign credentials definition delicacy denomination denotation designation detection differentiation disclosure distinguishing distinguishment dog tag echo empathy establishment evaluation expression exquisiteness factoring fellow feeling fineness fingering free association fusion gauging grouping hint hyperesthesia hyperpathia hypersensitivity identification badge identification tag indication indicativeness initials involvement irritability letter of introduction manifestation meaning mental linking merger monogram naming negative transference nervousness nicknaming oversensibility oversensitiveness overtenderness passibility pathos perception perceptiveness perceptivity photophobia picking out pinpointing pointing pointing out pointing to positive transference press card prickliness rapport realization recognition reidentification relating relationship response responsiveness selection sensitiveness sensitivity sensitization serial number sharing show showing sifting sifting out signature signification soreness sorting sorting out specification stream of consciousness styling substantiation suggestion supersensitivity sympathetic chord sympathetic response sympathy symptomaticness synesthesia synthesis tact tactfulness tenderness terming tessera tetchiness thin skin ticklishness touchiness transference unification union verification vibes vibrations visiting card weighing winnowing