1. energy, free energy

(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs

Example Sentences:
'energy can take a wide variety of forms'

• free energy

2. energy, vigor, vigour, zip

forceful exertion

Example Sentences:
'he plays tennis with great energy'
'he's full of zip'

• vigor
• vigour
• zip

3. energy, get-up-and-go, push

enterprising or ambitious drive

Example Sentences:
'Europeans often laugh at American energy'

• get-up-and-go
• push

4. energy, muscularity, vigor, vigour, vim

an imaginative lively style (especially style of writing)

Example Sentences:
'his writing conveys great energy'
'a remarkable muscularity of style'

• muscularity
• vigor
• vigour
• vim

5. energy, vim, vitality

a healthy capacity for vigorous activity

Example Sentences:
'jogging works off my excess energy'
'he seemed full of vim and vigor'

• vim
• vitality

6. energy

any source of usable power

Example Sentences:
'the DOE is responsible for maintaining the energy policy'

7. department of energy, doe, energy, energy department

the federal department responsible for maintaining a national energy policy of the United States; created in 1977

• department of energy
• doe
• energy department