'stationarily' originates from the English adjective 'stationary,' which comes from the Latin word 'stationarius,' where 'statio' meant 'a standing, post, job.'

'stationarius' transformed into the English 'stationary,' and the adverbial form 'stationarily' was created by adding the suffix '-ly.'

Initially, it meant 'in a manner of standing still,' and this meaning has remained consistent in modern usage.