plenum (n.)
- air
- all
- allness
- array
- articulation
- assembly
- assignation
- atom
- ball
- bank
- brawl
- buzz
- catena
- catenation
- caucus
- chain
- colloquium
- commission
- committee
- component
- concatenation
- conclave
- concourse
- congregation
- congress
- connection
- constituent
- continuum
- conventicle
- convention
- convocation
- cosmos
- council
- course
- creation
- cycle
- dance
- date
- descent
- diet
- drone
- earth
- eisteddfod
- element
- festivity
- fete
- file
- filiation
- fire
- forum
- gamut
- gathering
- gradation
- housewarming
- hum
- hyle
- hypostasis
- levee
- line
- lineage
- macrocosm
- material
- materiality
- matter
- meet
- meeting
- molecule
- monad
- monotone
- nature
- nexus
- panel
- party
- pendulum
- periodicity
- progression
- prom
- queue
- quorum
- rally
- range
- rank
- reception
- recurrence
- rendezvous
- reticulation
- rotation
- round
- routine
- row
- run
- scale
- seance
- sequence
- series
- session
- shindig
- sit-in
- sitting
- soiree
- spectrum
- string
- stuff
- substance
- substratum
- succession
- swath
- symposium
- synod
- system
- thread
- tier
- totality
- train
- turnout
- universe
- water
- world
