alternate

Adjective

• of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired
  • stems with alternate leaves
    

• occurring by turns; first one and then the other
  • alternating feelings of love and hate
    

• serving or used in place of another
  • an alternative plan
    

• every second one of a series
  • the cleaning lady comes on alternate Wednesdays
    
  • jam every other day- the White Queen
    

Noun

• someone who takes the place of another person

Verb

• do something in turns
  • We take turns on the night shift
    

• reverse (a direction, attitude, or course of action)

• be an understudy or alternate for a role

• exchange people temporarily to fulfill certain jobs and functions

• go back and forth; swing back and forth between two states or conditions

Related words

• Synonyms: 
  alternate(a) , alternating(a) , alternative , substitute , surrogate , replacement , take turns , interchange , tack , switch , flip , flip-flop , understudy , jump
• Antonyms: 
  opposite , paired