active /akˈtiv/

1. Acting
2. In actual operation
3. Given to action
4. Brisk
5. Busy
6. Nimble
7. Practical, opp to speculative
8. Effective
9. (of a volcano) liable to erupt, not extinct
10. (of bacteria, etc) potent
11. Radioactive
12. Of that voice in which the subject of the verb represents the doer of the action (grammar)

The active voice or an active construction

acˈtivate transitive verb

1. To make active
2. To increase the energy of
3. To increase the capacity for adsorption in (carbon)
4. To increase the biological activity of (sewage, etc) by aeration
5. To stimulate
6. To make radioactive

activāˈtion noun

acˈtivātor noun

A person or thing, substance, etc that activates

acˈtively adverb

acˈtiveness noun

acˈtivism noun

1. A policy of direct, vigorous and sometimes militant action
2. A philosophy of creative will, esp the practical idealism of Rudolf Eucken (1846–1926)

acˈtivist noun

1. A person who supports a policy of vigorous action
2. A person who plays a special part in advancing a project or in strengthening the hold of political ideas
3. A believer in the philosophy of activism

activˈity noun

1. Quality, state, or fact of being active
2. Occupation, esp recreational pursuit
3. A training exercise designed to teach through practical experiment, research, and discussion
4. (esp in pl) doings
5. The rate at which atoms of a radioactive substance disintegrate per unit of time

activated charcoal noun

Charcoal treated eg with acid to increase its absorptive power

active birth noun

Childbirth in which the mother chooses her own position and has a greater than usual freedom of movement

active control system noun (aeronautics)

An advanced automatic flight control system, integrating aerodynamics, structure and electronic design

active immunity noun

Immunity due to the making of antibodies within the organism

active life noun

Life, esp within a religious order, devoted to good works as opposed to contemplation

active list noun

A list of full-pay officers engaged in or available for military service

• pitchers
• pitches
• pitches have big ears
• pitch-farthing
• pitchfork
• pitchforked
• pitchforking
• pitchforks
• pitchier
• pitchiest
• pitch in
• pitchiness
• pitchinesses
• pitching
• pitchings
• pitching tool
• pitching tools
• pitching wedge
• pitching wedges
• pitch into
• pitchman
• pitchmen
• pitch on
• pitchperson
• pitchpine