linchpin (en)

(noun) a locking pin inserted crosswise (as through the end of an axle or shaft) / (noun) one that serves to hold together parts or elements that exist or function as a unit

trammeled (en)

(verb) to catch or hold in or as if in a net; enmesh / (verb) to prevent or impede the free play of; confine

unicameral (en)

(adjective) having or consisting of a single legislative chamber

unicameral (en)

(adjective) having or consisting of a single legislative chamber