reciprocal

/rɪˈsɪprəkəl/
adjective
  1. Given, felt, or done in return; mutual.
    • Her smile was met with a reciprocal grin from across the room.
    • They have a reciprocal friendship where both support each other equally.
    • The treaty established reciprocal trade agreements between the two countries.
noun
  1. A number that when multiplied by the original number gives 1 (e.g., the reciprocal of 2 is 1/2).
    • To solve the equation, find the reciprocal of 5, which is 1/5.
    • The teacher explained that the reciprocal of a fraction is obtained by flipping it.
    • If you multiply a number by its reciprocal, the result is always 1.
What does "reciprocal" mean? | whatsthatwordmean | whatsthatwordmean