optional; voluntary; arbitrary; arbitrary
engaging in (work); pursuing (e.g. studies); following (a profession); being involved in
most likely contender; prime candidate; top prospect; leading candidate
candidate; contender; prospect; candidacy; candidature; nomination
zeal; enthusiasm; ardor; ardour
irregularity; unsteadiness; disorderly
ambition; aspiration; sinister designs; treachery
playing; play (margin between on and off, gap before pressing button or lever has an effect)
cooperation; collaboration
to rank next to; to come after
expressive power; inventiveness; creative power
throughput; processing power
love; love-making; passion; emotion; affections
(computer) storage cell; storage element
waste (of money, time, etc.); squandering; frittering away
person in charge; senior staff; manager; chief; head
for convenience; as a matter of convenience
pay; salary; wages; allowance; grant; supply
having experienced (something); having had the experience (of)
February; second month of the lunar calendar
erasure; striking off; crossing out; cancellation; deletion
source of information; intelligence source; message source
comprehensive; composite; all-embracing
remote control; remote operation