What is the meaning of noticed?

verb

• Discover or determine the existence, presence, or fact of.
  • usage: "She detected high levels of lead in her drinking water"; "We found traces of lead in the paint"
  • synonyms: detect, observe, find, discover, notice
• Notice or perceive.
  • usage: "She noted that someone was following her"; "mark my words"
  • synonyms: notice, mark, note
• Make or write a comment on.
  • usage: "he commented the paper of his colleague"
  • synonyms: comment, notice, remark, point out
• Express recognition of the presence or existence of, or acquaintance with.
  • usage: "He never acknowledges his colleagues when they run into him in the hallway"; "She acknowledged his complement with a smile"; "it is important to acknowledge the work of others in one's own writing"
  • synonyms: notice, acknowledge

adjective

• Being perceived or observed.
  • usage: "an easily noticed effect on the rate of growth"