1. (

• establish ,
• base ,
• ground ,
• found

) use as a basis for; found on; "base a claim on some observation" ;

2. (

• base ,

) situate as a center of operations; "we will base this project in the new lab" ;

3. (

• free-base ,
• base

) use (purified cocaine) by burning it and inhaling the fumes ;

1. (

• basal ,
• base

) serving as or forming a base; "the painter applied a base coat followed by two finishing coats" ;

2. (

• base ,
• baseborn ,
• humble ,
• lowly

) of low birth or station (`base' is archaic in this sense); "baseborn wretches with dirty faces"; "of humble (or lowly) birth" ;

3. (

• base

) (used of metals) consisting of or alloyed with inferior metal; "base coins of aluminum"; "a base metal" ;

4. (

• base ,
• immoral

) not adhering to ethical or moral principles; "base and unpatriotic motives"; "a base, degrading way of life"; "cheating is dishonorable"; "they considered colonialism immoral"; "unethical practices in handling public funds" ;

5. (

• base ,
• mean ,
• meanspirited

) having or showing an ignoble lack of honor or morality; "that liberal obedience without which your army would be a base rabble"- Edmund Burke; "taking a mean advantage"; "chok'd with ambition of the meaner sort"- Shakespeare; "something essentially vulgar and meanspirited in politics" ;

6. (

• base ,
• baseborn

) illegitimate ;

7. (

• base

) debased; not genuine; "an attempt to eliminate the base coinage" ;