adj

• (informal) Fashionable; popular; up to date; current.
  "I think this band's sound is very now."
• (archaic, law) At the time the will is written. Used in order to prevent any inheritance from being transferred to a person of a future marriage. Does not indicate the existence of a previous marriage.
  "now wife"

adv

• (sentential) Used to introduce a point, a qualification of what has previously been said, a remonstration or a rebuke.
  "Now, we all want what is best for our children."
• (informal) At the present point of a recurring cycle or event.
  "I always used to do my shopping now, to avoid the rush."
• (obsolete, as but now) Very recently; not long ago; up to the present.
  "They that but now, for honour and for plate, / Made the sea blush with blood, resign their hate."
• (usually emphasized) Used to address a switching side, or sharp change in attitude from before.
  "Now, you want to protect me. An hour ago, you were mercilessly bullying me!"

conj

• (often with that) Since, because, in light of the fact.
  "Now all the children have grown up and left, the house is very quiet."

noun

• (uncountable) The present time.
  "Now is the right time."
• (often with the) The state of not paying attention to the future or the past.
  "She is living in the now."
• (countable, chiefly in phenomenology) A particular instant in time, as perceived at that instant.
  "Forever is composed of Nows— / 'T is not a different time, / Except for infiniteness / And latitude of home."