basis

Từ điển American Heritage Dictionary 4th

ba·sis (bāʹsĭs)n. pl. ba·ses (-sēz')
1. A foundation upon which something rests.
2. The chief constituent; the fundamental ingredient:
The basis for most liquids is water.
3. The fundamental principle.
4. An underlying circumstance or condition:
workers paid on a daily basis; friends who are on a first-name basis.
See Synonyms at base¹. [Middle English, from Latin, from Greek. See gʷā- in Indo-European Roots.]

• Từ đồng nghĩa / Synonyms:
  base, foundation, fundament, groundwork, cornerstone, footing, ground