thinking

Etymology 1

From Middle English thinking, thynkynge, thenkyng, equivalent to think + -ing.

noun

1. Thought; gerund of think.
   What is your thinking on this subject?
   But how the neurons are organised in these lobes and ganglia remains obscure. Yet this is the level of organisation that does the actual thinking—and is, presumably, the seat of consciousness. 2013-08-03, “The machine of a new soul”, in The Economist, volume 408, number 8847
   When BR "back-checked" (BR's term) the financial results of steam replacement across 49 schemes, where DMUs had been substituted on the London Midland Region, only one was now profitable. BR thinking on such substitutions referred to "betterment", not profit or loss. March 8 2023, David Clough, “The long road that led to Beeching”, in RAIL, number 978, page 43

Etymology 2

From Middle English thenkinge, þinkynge, þenkynge, þenchinde, from Old English þenċende, from Proto-Germanic *þankijandz, present participle of *þankijaną (“to think”), equivalent to think + -ing. Cognate with Dutch denkend (“thinking”), German denkend (“thinking”), Swedish tänkande (“thinking”).

verb

1. present participle and gerund of think
   I'm thinking about inventing a new perpetual-motion machine.