optional; voluntary; arbitrary; arbitrary
actual spot; scene (of a crime, accident, etc.); (on) site; (on) the ground; filming location; (movie) set
disorder; chaos; confusion; mayhem
attendance; presence; appearance
to offer; to propose; to suggest; to put forward; to request; to ask (for)
breaking up (e.g. meeting); dispersing (e.g. crowd); dissolving (company, organization, etc.); liquidating; dissolving (diet, parliament, etc.)
to call out to; to hail; to address; to appeal
rough (estimate, outline, etc.); broad; general; generous; openhanded
tool (esp. software, etc.); tour (e.g. Tour de France)
soft; tender; gentle; mild; informal; light
to set (sun); to become dark
heating; application of heat
alternation; change; relief; relay; shift; substitution (sports, etc.)
to accomplish; to fulfill; to carry out
course (e.g. of lectures); academic university unit (professor, lecturers, etc.)
declining; refusal; rejection; announcement; notice
comprehension; understanding
first; firstly; first of all; Introduction; Preface
students attending lectures
example; simile; metaphor; allegory
concrete; definite; specific; material; substantial
youthful indiscretion; youthful enthusiasm; youthful excess
to overdo; to do too much
to swear; to vow; to take an oath; to pledge
first time; first innings; initial attempt; first; initial
anyone; anybody; everyone; whoever
nuclear fission; karyokinesis (division of a cell nucleus during mitosis or meiosis)
to stop; to stay (e.g. the night); to contain; to keep (in position, in place); to record (e.g. a fact); to retain
request; commission; entrusting (with a matter); dependence; reliance
guidance; lead; guide; primer; influence; connections
textbook; coursebook; schoolbook
meek; quiet; docile; mysterious; marvelous; marvellous
meeting; conference; session; assembly; council; convention
alias; pseudonym; pen name; nom de plume; different name; other name
to slip out; to sneak away; to break into the lead; to get ahead; to begin to fall out (e.g. hair); to break out (of a loop)
light; well-lit; bright (of a colour); brightly-coloured; cheerful; bright; encouraging (for the future of a project, etc.)
townscape; street (of stores and houses); (look of) stores and houses on street
(on) land; ground; shore; track-and-field events
foot (of a mountain or hill); bottom; base
precipitous cliff; sheer precipice; critical situation
vague; ambiguous; shady; disreputable; fuzzy