crystalline lens (of the eye)
signal; signalling; signaling; traffic light; traffic signal
change; conversion; transformation; transformation
output (electrical, signal, etc.)
process; operation; stage of a process; progress of work
to switch (secretly); to substitute; to replace; to sidestep (an issue)
information transfer; information transmission
all; altogether; entirely; exactly alike (e.g. in appearance); spitting image of; identical
cross mark; demerit mark; an X
transplant surgery; transplant operation; (organ) transplantation
organic matter; organic compound
inorganic matter; inorganic substance; inorganic compound
light-emitting diode; LED
light-emitting diode; LED
fluorescent lamp; fluorescent light; person who is slow to react; someone slow on the uptake
to exchange; to swap; to barter; to replace; to substitute
to replace; to change (for a new one); to renew; to reassign (an expense); to charge (to a different account); to shift (a loss)
time; labour; payment (for labour); pay; tedious job; troublesome job
ultraviolet rays; ultraviolet radiation; UV radiation
infrared rays; infrared radiation
cut; cutting; omission; cutting; haircut; (continuous) shot (in a film or TV show); illustration (in a book, newspaper, etc.)
decider; person who decides; decisive factor; clincher; key
dispute; controversy; debate; argument; taking issue
counter for waves (of a repeated occurrence)
both; both sides; both parties
nature (of a person); disposition; temperament; quality; inherent characteristic; property
to have two things (at the same time) (e.g. good and bad points); to also have something (in addition to something else)
what happens twice will happen thrice
refreshing (e.g. feeling, scene, wind, morning air); brisk; bracing; fresh; refreshed