1 a : union or junction of surfaces- Cooling begins when the lava makes contact with the air.
b : the apparent touching or mutual tangency of the limbs of two celestial bodies or of the disk of one body with the shadow of another during an eclipse, transit, or occultation.
c 1) : the junction of two electrical conductors through which a current passes 2) : a special part made for such a junction- The camera's flash wasn't working because the electrical contacts needed to be cleaned.
2 a : association, relationship -students and teachers in daily contact.
b : connection, communication- I lost contact with her years ago.
c : an establishing of communication with someone or an observing or receiving of a significant signal from a person or object- Radar contact with Mars.
3 a person serving as a go-between, messenger, connection, or source of special information- Business contacts.
4 contact lens- She wears contacts more often than glasses.