optimization; optimisation
mixture; jumble; blend; making a cord by entwining threads of various colours
reincarnation; rebirth; transmigration; metempsychosis
to maintain; to continue to have
natural state; natural condition
population; universe; parent set
training; drill; practice; practising; discipline
secret (recipe, medicine, etc.); mysteries (e.g. of an art)
to take up one's residence
regrettable; vexing; upsetting; unthinkable; wholly unexpected
defeating an argument; winning an argument; refutation; confutation
fanatic; fanatic believer; zealot
(reciprocal) communication; (coming to a) mutual understanding
to curve; to twist; to be contrary; to be uncooperative; to be rebellious
full house; all seats occupied; fully occupied
(musical) conductor; commander; leader; director
clean sweep; purging; doing away with; eradication
ideal land; earthly paradise; Utopia; Arcadia
to build up; to complete; to construct; to make up; to fabricate; to invent
erratic; offbeat; wild; unconventional; extraordinary; weird
interest; rights; concession
the other day; some time ago; recently
fixed interval; fixed period
to go with the flow; to go with the times
equal (in ability); even; evenly matched; well-matched; on par (with)
to go past (a place or thing); to go beyond
to be flabbergasted; to be dumbfounded
stimulating; exciting; provocative
slaughter (of animals for meat); butchery
reason; logic; method; system; order
infection; contagion; becoming infected; being infected (e.g. with harmful ideas); being influenced (by)
act (usu. undesirable); action; deed; conduct
private enterprise; private business; private company; private firm; private-sector business; private-sector corporation
to mix (with); to be mixed (together); to be mingled
looking pale; looking unwell