Accelerator

Noun · Startup & VC · Origin: 2005

Definitions

  1. Accelerator is a startup program that provides early-stage companies with mentorship, funding, office space, and networking opportunities in exchange for equity, typically over a fixed period of three to six months. Leading accelerators like Y Combinator, Techstars, and 500 Startups accept cohorts of startups and culminate in a demo day where founders pitch to investors. The intensive curriculum covers product development, customer acquisition, fundraising strategy, and scaling operations. In a hardware context, an accelerator can also refer to specialized computing hardware like GPUs, TPUs, or FPGAs that speed up specific workloads such as machine learning training and inference. Both meanings share the core idea of taking something that already exists and dramatically increasing its speed of progress or execution.

    In plain English: A boot camp for startups — a few months of intense mentorship and some seed money, ending with a pitch to investors. Y Combinator is the most famous.

  2. In hardware and computing, an accelerator is a specialized processor (GPU, TPU, FPGA) designed to perform specific computations faster than a general-purpose CPU. The term predates its startup meaning by decades.

    Example: 'We added a hardware accelerator for the inference workload and cut response times from 200ms to 15ms.'

    Source: hardware / computing

Etymology

2005
Y Combinator launches as the first modern startup accelerator, offering seed funding and mentorship in exchange for equity.
2006
TechStars (now Techstars) launches in Boulder, CO, establishing the cohort-based accelerator model.
2010s
Corporate accelerators proliferate as large companies (Google, Microsoft, Barclays) adopt the format for innovation.
2020s
The accelerator model expands globally, with thousands of programs worldwide. The term also gains use in hardware (AI accelerators).

Origin Story

The Startup Boot Camp That Changed Silicon Valley

The term 'accelerator' in its startup context traces back to 2005, when Paul Graham, Jessica Livingston, Trevor Blackwell, and Robert Tappan Morris launched Y Combinator in Cambridge, Massachusetts. Though Y Combinator called itself a 'seed-stage investment firm,' the model it created, providing small amounts of funding, mentorship, and a structured program culminating in a demo day, became the template for what the world would call startup accelerators. The term itself gained widespread use around 2006-2007 as other organizations copied the model. TechStars (founded 2006 in Boulder, Colorado) was among the first to explicitly brand itself as an accelerator. The word was borrowed from physics, where a particle accelerator speeds particles to high energies. Similarly, a startup accelerator compresses years of business learning into weeks or months. Before accelerators, the path from idea to funded startup was murky and heavily dependent on personal connections. Accelerators democratized the process, creating a repeatable pipeline from raw founders to investor-ready companies. By the 2020s, there were over 3,000 accelerator programs worldwide, and Y Combinator alumni alone had produced companies worth over $600 billion combined.

Context: Y Combinator model, 2005-2007

Fun fact: Y Combinator's first batch in 2005 funded eight startups with just $6,000 each (plus $2,000 per founder). One of them, Reddit, was acquired by Conde Nast just 16 months later.

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