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100

To make longer

What is "elongate"

100
To extend the time of; to draw out 
What is "prolong"
100

To make shorter

What is "abbreviate"

100

Shortness

What is "brevity"

100

Thickness; mass

What is "density"

200

To make thicker or shorter

What is "condense"

200
Very thin; starving

What is "emaciated"

200

Not plentiful

What is "meager"

200

Interested and careful

What is "attentive"

200

To mean; to have in one's mind

What is "intend"

300

The root word "long" means...

LONG. lol
300

The root word "brev" means...

"Brief"

300

The root word "dens" means

THICK

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The root word "mac/meag" means
Thin
300

The root word "tend/tent" means

To stretch