Definition of observationality in English:
observationality
noun ˌɒbzəveɪʃəˈnalɪtiˌɒbzəveɪʃnˈalɪti
Dependence upon observation as opposed to theory.
Origin
1960s; earliest use found in W. V. Quine (1908–2000), philosopher. From observational + -ity; compare -ality.