Etymology
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Words related to Reichstag

Reich (n.)
German, "kingdom, realm, state," from Old High German rihhi "realm," from Proto-Germanic *rikja "rule" (source also of Old Norse riki, Danish rige, Old Frisian and Middle Dutch rike, Dutch rijk, Old English rice, Gothic reiki), from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule." Don Ringe, "From Proto-Indo-European to Proto-Germanic" [Oxford 2006] identifies it as a Celtic loan-word in Germanic rather than a direct evolution from PIE, based on the vowel. Used in English from 1871-1945 to refer to "the German state, Germany." Most notoriously in Third Reich (see third); there never was a First or Second in English usage.
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day (n.)

Old English dæg "period during which the sun is above the horizon," also "lifetime, definite time of existence," from Proto-Germanic *dages- "day" (source also of Old Saxon, Middle Dutch, Dutch dag, Old Frisian di, dei, Old High German tag, German Tag, Old Norse dagr, Gothic dags), according to Watkins, from PIE root *agh- "a day."  He adds that the Germanic initial d- is "of obscure origin." But Boutkan says it is from PIE root *dhegh- "to burn" (see fever). Not considered to be related to Latin dies (which is from PIE root *dyeu- "to shine").

Meaning originally, in English, "the daylight hours;" it expanded to mean "the 24-hour period" in late Anglo-Saxon times. The day formerly began at sunset, hence Old English Wodnesniht was what we would call "Tuesday night." Names of the weekdays were not regularly capitalized in English until 17c.

From late 12c. as "a time period as distinguished from other time periods." Day-by-day "daily" is from late 14c.; all day "all the time" is from late 14c.  Day off "day away from work" is attested from 1883; day-tripper first recorded 1897. The days in nowadays, etc. is a relic of the Old English and Middle English use of the adverbial genitive.

All in a day's work "something unusual taken as routine" is by 1820. The nostalgic those were the days is attested by 1907. That'll be the day, expressing mild doubt following some boast or claim, is by 1941. To call it a day "stop working" is by 1919; earlier call it a half-day (1838). One of these days "at some day in the near future" is from late 15c. One of those days "a day of misfortune" is by 1936.

*agh- 
Proto-Indo-European root meaning "a day" (as a unit of time). The initial d- in Germanic is of obscure origin.

It forms all or part of: adays; Bundestag; daily; daisy; dawn; day; holiday; Reichstag; today.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dah "to burn," Lithuanian dagas "hot season," Old Prussian dagis "summer."
kingdom (n.)
Old English cyningdom; see king (n.) + -dom. Cognate with Old Saxon kuningdom, Middle Dutch koninghdom, Old Norse konungdomr. The usual Old English word was cynedom; Middle English also had kingrick (for second element, see the first element in Reichstag). Meaning "one of the realms of nature" is from 1690s.

Kingdom-come (n.) "the next world, the hereafter" (1785), originally slang, is from the Lord's Prayer, where it is an archaic simple present subjunctive ("may Thy kingdom come") in reference to the spiritual reign of God or Christ.