Meaning

noun the dimension through an object as opposed to its length or width

noun indistinct articulation

noun used of a line or mark

originFrom Middle English thikkenesse, thiknesse, from Old English þicnes (“thickness, viscosity, density, hardness; obscurity, cloud, darkness; thicket; depth, a thick body, anything thick or heavy”), from Proto-West Germanic *þikkwīnassī (“thickness”), equivalent to thick + -ness. Cognate with West Frisian tsjokkens (“thickness”), Old High German dickinessī, dikkinissi, diknissi (“thickness,…

Etymology from Wiktionary, CC BY-SA 3.0