What is the definition or description of: inability to recognize objects?

Visual agnosia: Agnosia is a broad term for problems with sensory perception. It can include visual agnosia, some types of which can result in problems recognizing normally familiar objects. See a comprehensive discussion here: https://en.wikipedia.org/wiki/Agnosia

Visual agnosia is an impairment in recognizing visually presented objects despite normal visual acuity and visual fields, normal color vision and brightness, normal discrimination, normal language and normal memory. Patients can recognize objects using other sensory modalities (example touch). Tactile agnosia-difficulty recognizing objects by touch but intact ability to name by sight