English Words Starting With A

• active site

  nounC1/C2
  /ˈæk.tɪv ˌsaɪt/The specific region on an enzyme where substrate molecules bind and undergo a chemical reaction.
• active sun

  nounLow (Specialist/Scientific)
  /ˈæk.tɪv ˈsʌn/The Sun during periods of high solar activity, characterised by frequent sunspots, solar flares, and coronal mass ejections.
• active transport

  nounC1/C2
  /ˌæk.tɪv ˈtræn.spɔːt/A biological process where cells use energy to move substances (e.g., ions, molecules) across a membrane against their concentration gradient.
• active vocabulary

  nounB2-C1
  /ˌæk.tɪv vəˈkæb.jə.lər.i/The set of words and phrases that a person or language learner can use correctly in speech and writing when producing language.
• active-matrix

  adjectivenounC1
  /ˌæk.tɪv ˈmeɪ.trɪks/A type of liquid crystal display (LCD) technology where each pixel is controlled by its own dedicated transistor, allowing for faster response times, sharper images, and wider viewing angles compared to passive-matrix displays.
• activewear

  nounC1
  /ˈæk.tɪv.weər/Clothing designed for physical exercise, sports, or athletic activities.
• activin

  nounLow
  /ˈæk.tɪ.vɪn/A protein hormone involved in regulating cell growth and differentiation, particularly in reproductive and developmental processes.
• activism

  nounMedium
  /ˈæk.tɪ.vɪ.zəm/The practice of taking direct and often public action to achieve political or social change.
• activist

  adjectivenounB2
  /ˈæk.tɪ.vɪst/A person who campaigns vigorously to bring about political or social change.
• activities

  nounHigh
  /ækˈtɪv.ə.tiz/Specific actions, tasks, or pursuits that a person or group does, often for a particular purpose, interest, or enjoyment.
• activity

  nounHigh
  /ækˈtɪv.ə.ti/The state or quality of being active; movement or action.
• activity of daily living

  nounC2
  /ækˈtɪv.ə.ti əv ˌdeɪ.li ˈlɪv.ɪŋ/A basic self-care task necessary for independent living, such as eating, bathing, or dressing.
• activize

  verb-transitiveVery Low / Technical
  /ˈæk.tɪ.vaɪz/to make active; to stimulate into action.
• acto

  nounC1
  /ækt/A single, distinct part or division of a play, opera, ballet, or other theatrical performance.
• actomyosin

  nounVery Low
  /ˌaktə(ʊ)ˈmʌɪəsɪn/A protein complex in muscle cells responsible for contraction.
• acton

  nounVery Rare
  /ˈæk.tən/A padded, quilted jacket worn as defensive armour under a coat of mail in the medieval period.
• actor

  nounB1
  /ˈæktə(r)/A person who performs a role in a play, film, or television show.
• actor-manager

  nounLow
  /ˈæktə ˈmænɪdʒə/A person who both performs as an actor and manages the business and artistic affairs of a theatre company or production.
• actors' equity association

  nounLow-medium (specialist vocabulary within performing arts and labor contexts)
  /ˈæk.təz ˈek.wɪ.ti əˌsəʊ.siˈeɪ.ʃən/The labor union representing stage actors and stage managers in the United States.
• actress

  nounB2
  /ˈæktrəs/A female person who acts in plays, films, or television shows.

Showing 1081–1100 of 8734 words.