<p><strong>Adjective</strong></p><ul><li>having a specified object or material as its base or foundation or as its primary constituent (often used in combination):<ul><li>Our house was one of the three stone-based houses of that era, built by my maternal grandfather.</li></ul></li><li>established, grounded, or focused on a specified principle or belief, fact, method, etc. (often used in combination):<ul><li>It’s a culturally based phys ed curriculum that uses Indian traditions and values to teach healthy lifestyle habits.</li><li>There are a number of promising evidence-based treatment modalities to address depression.</li></ul></li><li>having a specified place as its primary location or headquarters; stationed or situated (often used in combination):<ul><li>A centrally based Houston media agency is looking for a Digital Account Manager to help with a key communications client.</li><li>The Chicago-based HIV/AIDS organization provides housing, healthcare, and substance abuse programs for its clients.</li></ul></li><li>having a specified origin or source (often used in combination):<ul><li>They want to replace animal-based foods with plant-based milks and vegetable protein.</li></ul></li><li>Slang: true to one’s self or secure in one’s beliefs regardless of what others think, especially when those beliefs fall outside of the mainstream:<ul><li>Her presentation was so based—did you see the teacher's expression? Priceless!</li></ul></li></ul><p><strong>Interjection</strong></p><ul><li>Slang: (used to express approval or respect, especially in response to a social media post):<ul><li>Based. At least somebody shows some spine on this forum.</li></ul></li></ul><p><strong>Verb</strong></p><ul><li>the simple past tense and past participle of base.</li></ul>